Bundle-Migration errors with "cannot access file...being used by another process"

[bricelam]

Originally reported by @ryanrichard19 in #19693 (comment)

For some reason, dotnet publish is behaving differently between Bundle-Migration and dotnet ef migrations bundle.

PM> Bundle-Migration -Verbose
Using project 'MarketingIncentive.Data'.
Using startup project 'MarketingIncentive.API'.
Build started...
Build succeeded.
C:\Program Files\dotnet\dotnet.exe exec --depsfile C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.API.deps.json --additionalprobingpath C:\Users\mrrar\.nuget\packages --additionalprobingpath "C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages" --additionalprobingpath "C:\Program Files (x86)\Microsoft\Xamarin\NuGet" --additionalprobingpath "C:\Program Files\dotnet\sdk\NuGetFallbackFolder" --runtimeconfig C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.API.runtimeconfig.json C:\Users\mrrar\.nuget\packages\microsoft.entityframeworkcore.tools\6.0.0-preview.7.21378.4\tools\netcoreapp2.0\any\ef.dll migrations bundle --verbose --no-color --prefix-output --assembly C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll --project C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\MarketingIncentive.Data.csproj --startup-assembly C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.API.dll --startup-project C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj --project-dir C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\ --language C# --working-dir C:\Users\mrrar\Development\MarketingIncentive --root-namespace MarketingIncentive.Data
Using assembly 'MarketingIncentive.Data'.
Using startup assembly 'MarketingIncentive.API'.
Using application base 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0'.
Using working directory 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API'.
Using root namespace 'MarketingIncentive.Data'.
Using project directory 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\'.
Remaining arguments: .
Finding DbContext classes...
Finding IDesignTimeDbContextFactory implementations...
Finding application service provider in assembly 'MarketingIncentive.API'...
Finding Microsoft.Extensions.Hosting service provider...
Using environment 'Development'.
Using application service provider from Microsoft.Extensions.Hosting.
Found DbContext 'MarketingIncentiveDBContext'.
Finding DbContext classes in the project...
Using context 'MarketingIncentiveDBContext'.
Building bundle...
dotnet publish --output C:\Users\mrrar\AppData\Local\Temp\etc5av4u.vrh\publish
Microsoft (R) Build Engine version 17.0.0-preview-21378-03+d592862ed for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Restored C:\Users\mrrar\AppData\Local\Temp\etc5av4u.vrh\bundle.csproj (in 319 ms).
  2 of 3 projects are up-to-date for restore.
  You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
  You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
  MarketingIncentive.Data -> C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 1 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 2 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 3 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 4 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 5 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 6 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 7 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 8 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 9 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 10 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): error MSB3027: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Exceeded retry count of 10. Failed.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): error MSB3021: Unable to copy file "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process. [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
Microsoft.EntityFrameworkCore.Tools.CommandException: Build failed. Use --verbose to see errors.
   at Microsoft.EntityFrameworkCore.Tools.Commands.MigrationsBundleCommand.Execute(String[] args) in ef.dll:token 0x60001a9+0x23b
   at Microsoft.EntityFrameworkCore.Tools.Commands.CommandBase.<>c__DisplayClass0_0.<Configure>b__0(String[] args) in ef.dll:token 0x6000205+0x3b
   at Microsoft.DotNet.Cli.CommandLine.CommandLineApplication.Execute(String[] args) in ef.dll:token 0x6000053+0x100
   at Microsoft.EntityFrameworkCore.Tools.Program.Main(String[] args) in ef.dll:token 0x60000cf+0x2e
Build failed. Use --verbose to see errors.

[ajcvickers]

Note from triage: consider removing.

[karl-sjogren]

I'm seeing the same problem when running dotnet ef migrations bundle --verbose while the project is open in VSCode. If I close VSCode it works. I'm running on preview7 on Windows 10 and I've tried by removing my runtime targets and such but the error persists even with a minimal project file (see below).

$ dotnet ef migrations bundle --verbose
Using project 'X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj'.
Using startup project 'X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj'.
Writing 'X:\Github\songbird\src\Songbird.Web\obj\Songbird.Web.csproj.EntityFrameworkCore.targets'...
dotnet msbuild /target:GetEFProjectMetadata /property:EFProjectMetadataFile=C:\Users\Karl\AppData\Local\Temp\tmp5143.tmp /verbosity:quiet /nologo X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj
Writing 'X:\Github\songbird\src\Songbird.Web\obj\Songbird.Web.csproj.EntityFrameworkCore.targets'...
dotnet msbuild /target:GetEFProjectMetadata /property:EFProjectMetadataFile=C:\Users\Karl\AppData\Local\Temp\tmp5309.tmp /verbosity:quiet /nologo X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj
Build started...
dotnet build X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj /verbosity:quiet /nologo

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:02.33
Build succeeded.
dotnet exec --depsfile X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.deps.json --additionalprobingpath C:\Users\Karl\.nuget\packages --additionalprobingpath "C:\Program Files\dotnet\sdk\NuGetFallbackFolder" --runtimeconfig X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.runtimeconfig.json C:\Users\Karl\.nuget\packages\dotnet-ef\6.0.0-preview.7.21378.4\tools\netcoreapp3.1\any\tools\netcoreapp2.0\any\ef.dll migrations bundle --assembly X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll --project X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj --startup-assembly X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll --startup-project X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj --project-dir X:\Github\songbird\src\Songbird.Web\ --root-namespace Songbird.Web --language C# --working-dir X:\Github\songbird\src\Songbird.Web --verbose
Using assembly 'Songbird.Web'.
Using startup assembly 'Songbird.Web'.
Using application base 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0'.
Using working directory 'X:\Github\songbird\src\Songbird.Web'.
Using root namespace 'Songbird.Web'.
Using project directory 'X:\Github\songbird\src\Songbird.Web\'.
Remaining arguments: .
Finding DbContext classes...
Finding IDesignTimeDbContextFactory implementations...
Finding application service provider in assembly 'Songbird.Web'...
Finding Microsoft.Extensions.Hosting service provider...
Using environment 'Development'.
Using application service provider from Microsoft.Extensions.Hosting.
Found DbContext 'SongbirdContext'.
Finding DbContext classes in the project...
Using context 'SongbirdContext'.
Building bundle...
dotnet publish --output C:\Users\Karl\AppData\Local\Temp\pqtfcewu.r5o\publish
Microsoft (R) Build Engine version 17.0.0-preview-21378-03+d592862ed for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Restored C:\Users\Karl\AppData\Local\Temp\pqtfcewu.r5o\bundle.csproj (in 735 ms).
  1 of 2 projects are up-to-date for restore.
  You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 1 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 2 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 3 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 4 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 5 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 6 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 7 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 8 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 9 in 1000ms. The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): warning MSB3026: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Beginning retry 10 in 1000ms. The process cannot 
access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): error MSB3027: Could not copy "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". Exceeded retry count of 10. Failed.  [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4508,5): error MSB3021: Unable to copy file "obj\Debug\net6.0\Songbird.Web.dll" to "bin\Debug\net6.0\Songbird.Web.dll". The process cannot access the file 'X:\Github\songbird\src\Songbird.Web\bin\Debug\net6.0\Songbird.Web.dll' because it is being used by another process. [X:\Github\songbird\src\Songbird.Web\Songbird.Web.csproj]
Microsoft.EntityFrameworkCore.Tools.CommandException: Build failed. Use --verbose to see errors.
   at Microsoft.EntityFrameworkCore.Tools.Commands.MigrationsBundleCommand.Execute(String[] args) in ef.dll:token 0x60001a9+0x23b
   at Microsoft.EntityFrameworkCore.Tools.Commands.CommandBase.<>c__DisplayClass0_0.<Configure>b__0(String[] args) in ef.dll:token 0x6000205+0x3b
   at Microsoft.DotNet.Cli.CommandLine.CommandLineApplication.Execute(String[] args) in ef.dll:token 0x6000053+0x100
   at Microsoft.EntityFrameworkCore.Tools.Program.Main(String[] args) in ef.dll:token 0x60000cf+0x2e
Build failed. Use --verbose to see errors.

This is the project I'm trying to build a bundle for. Both building and publishing works fine.

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="AspNetCore.HealthChecks.UI" Version="5.0.1" />
    <PackageReference Include="AspNetCore.HealthChecks.UI.Client" Version="5.0.1" />
    <PackageReference Include="AutoMapper.Collection" Version="7.0.1" />
    <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="8.1.1" />
    <PackageReference Include="LetterAvatars.AspNetCore" Version="2.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="6.0.0-preview.7.21378.6" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.0-preview.7.21378.4">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.0-preview.7.21378.4" />
    <PackageReference Include="Microsoft.Extensions.Caching.SqlServer" Version="6.0.0-preview.7.21378.6" />
    <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" Version="6.0.0-preview.7.21378.6" />
    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="6.0.0-preview.7.21378.6" />
    <PackageReference Include="Microsoft.Extensions.Logging.AzureAppServices" Version="6.0.0-preview.7.21378.6" />
    <PackageReference Include="Microsoft.Identity.Web" Version="1.16.0" />
    <PackageReference Include="Microsoft.Identity.Web.MicrosoftGraph" Version="1.16.0" />
    <PackageReference Include="NEST" Version="7.14.1" />
    <PackageReference Include="NEST.JsonNetSerializer" Version="7.14.1" />
    <PackageReference Include="RobotsTxtCore" Version="1.1.0" />
    <PackageReference Include="Serilog.AspNetCore" Version="4.1.0" />
  </ItemGroup>
</Project>

[bricelam]

This appears to be fixed on RC1 with latest version of Visual Studio. I wonder if OmniSharp just needs to catch up too...