Difference in build success across branches?

[doctor-phil]

It seems like very frequently, test/preview builds will succeed on alternative branches, but fail when they are merged into main.

Furthermore, when drafting a release/publish from main, more build issues will appear even if the preview build succeeds after the latest change on main

This causes a 3+ step debug routine for any changes that is not ideal. @mmcky do you have any idea what might be causing this disconnect?