diff --git a/src/method.c b/src/method.c
index c33b343742dc8..46a4f5bc4d56c 100644
--- a/src/method.c
+++ b/src/method.c
@@ -958,6 +958,9 @@ JL_DLLEXPORT void jl_method_set_source(jl_method_t *m, jl_code_info_t *src)
     }
     src = jl_copy_code_info(src);
     src->isva = m->isva; // TODO: It would be nice to reverse this
+    // If nargs hasn't been set yet, do it now. This can happen if an old CodeInfo is deserialized.
+    if (src->nargs == 0)
+        src->nargs = m->nargs;
     assert(m->nargs == src->nargs);
     src->code = copy;
     jl_gc_wb(src, copy);
diff --git a/stdlib/Serialization/src/Serialization.jl b/stdlib/Serialization/src/Serialization.jl
index 3c4152bf10598..1b25c59bf3cdf 100644
--- a/stdlib/Serialization/src/Serialization.jl
+++ b/stdlib/Serialization/src/Serialization.jl
@@ -8,6 +8,7 @@ Provide serialization of Julia objects via the functions
 module Serialization
 
 import Base: Bottom, unsafe_convert
+import Base.ScopedValues: ScopedValue, with
 import Core: svec, SimpleVector
 using Base: unaliascopy, unwrap_unionall, require_one_based_indexing, ntupleany
 using Core.IR
@@ -28,6 +29,8 @@ end
 
 Serializer(io::IO) = Serializer{typeof(io)}(io)
 
+const current_module = ScopedValue{Union{Nothing,Module}}(nothing)
+
 ## serializing values ##
 
 const n_int_literals = 33
@@ -1064,7 +1067,10 @@ function deserialize(s::AbstractSerializer, ::Type{Method})
     nospecializeinfer = false
     constprop = 0x00
     purity = 0x0000
-    template_or_is_opaque = deserialize(s)
+    local template_or_is_opaque, template
+    with(current_module => mod) do
+        template_or_is_opaque = deserialize(s)
+    end
     if isa(template_or_is_opaque, Bool)
         is_for_opaque_closure = template_or_is_opaque
         if format_version(s) >= 24
@@ -1078,7 +1084,9 @@ function deserialize(s::AbstractSerializer, ::Type{Method})
         elseif format_version(s) >= 17
             purity = UInt16(deserialize(s)::UInt8)
         end
-        template = deserialize(s)
+        with(current_module => mod) do
+            template = deserialize(s)
+        end
     else
         template = template_or_is_opaque
     end
@@ -1182,6 +1190,22 @@ function deserialize(s::AbstractSerializer, ::Type{PhiNode})
     return PhiNode(edges, values)
 end
 
+# v1.12 disallows bare symbols in IR, but older CodeInfos might still have them
+function symbol_to_globalref(@nospecialize(x), m::Module)
+    mapper(@nospecialize(x)) = symbol_to_globalref(x, m)
+    if x isa Symbol
+        return GlobalRef(m, x)
+    elseif x isa Expr
+        return Expr(x.head, map(mapper, x.args)...)
+    elseif x isa ReturnNode
+        return ReturnNode(mapper(x.val))
+    elseif x isa GotoIfNot
+        return GotoIfNot(mapper(x.cond), x.dest)
+    else
+        return x
+    end
+end
+
 function deserialize(s::AbstractSerializer, ::Type{CodeInfo})
     ci = ccall(:jl_new_code_info_uninit, Ref{CodeInfo}, ())
     deserialize_cycle(s, ci)
@@ -1200,6 +1224,9 @@ function deserialize(s::AbstractSerializer, ::Type{CodeInfo})
             end
         end
     end
+    if current_module[] !== nothing
+        map!(x->symbol_to_globalref(x, current_module[]), code)
+    end
     _x = deserialize(s)
     have_debuginfo = _x isa Core.DebugInfo
     if have_debuginfo
@@ -1248,6 +1275,9 @@ function deserialize(s::AbstractSerializer, ::Type{CodeInfo})
         ci.slottypes = deserialize(s)
         ci.rettype = deserialize(s)
         ci.parent = deserialize(s)
+        if format_version(s) < 29 && ci.parent isa MethodInstance && ci.parent.def isa Method
+            ci.nargs = ci.parent.def.nargs
+        end
         world_or_edges = deserialize(s)
         pre_13 = isa(world_or_edges, Union{UInt, Int})
         if pre_13
@@ -1258,7 +1288,7 @@ function deserialize(s::AbstractSerializer, ::Type{CodeInfo})
             ci.min_world = deserialize(s)::UInt
             ci.max_world = deserialize(s)::UInt
         end
-        if format_version(s) >= 26
+        if format_version(s) >= 29
             ci.method_for_inference_limit_heuristics = deserialize(s)
         end
     end
diff --git a/stdlib/Serialization/test/runtests.jl b/stdlib/Serialization/test/runtests.jl
index f1b83ca947c7e..e341c6e3eb9ec 100644
--- a/stdlib/Serialization/test/runtests.jl
+++ b/stdlib/Serialization/test/runtests.jl
@@ -1,6 +1,7 @@
 # This file is a part of Julia. License is MIT: https://julialang.org/license
 
 using Test, Random, Serialization, Base64
+using Base.ScopedValues: with
 
 # Check that serializer hasn't gone out-of-frame
 @test Serialization.sertag(Symbol) == 1
@@ -661,3 +662,14 @@ end
     @test_broken isempty(undoc)
     @test undoc == [:AbstractSerializer, :Serializer]
 end
+
+# test method definitions from v1.11
+if Int === Int64
+    let f_data = "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"
+        @eval Main function f111_to_112 end
+        Core.eval(Main, with(Serialization.current_module => Main) do
+                 deserialize(IOBuffer(base64decode(f_data)))
+             end)
+        @test @invokelatest(Main.f111_to_112(16)) == 256
+    end
+end