Preloaded disposables don't automatically start on r4.3-rc1

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How to file a helpful issue

Qubes OS release

r4.3-rc1

Brief summary

Preloaded disposables don't automatically start on r4.3-rc1. Disabling and re-enabling the checkbox helps to start them, but does not fix the after-reboot problems.

Seems to be caused by the systemd service not being enabled. I started and enabled the service to fix that. Upgraded to r4.3-rc1 in-place.

user@dom0 ~ % sudo systemctl status qubes-preload-dispvm.service 
○ qubes-preload-dispvm.service - Preload Qubes DispVMs
     Loaded: loaded (/usr/lib/systemd/system/qubes-preload-dispvm.service; disabled; preset: disabled)
    Drop-In: /usr/lib/systemd/system/service.d
             └─10-timeout-abort.conf, 50-keep-warm.conf
     Active: inactive (dead)

user@dom0 ~ % sudo systemctl enable --now qubes-preload-dispvm.service
Created symlink '/etc/systemd/system/multi-user.target.wants/qubes-preload-dispvm.service' → '/usr/lib/systemd/system/qubes-preload-dispvm.service'.

Steps to reproduce

1. Upgrade to r4.3-rc1 in-place
2. Enable preloaded disposables
3. Reboot

Expected behavior

Disposables get launched on boot.

Actual

Nuh uh.