Opening a project in different versions causes mass asset reimport

[KoBeWi]

Tested versions

4.3 beta3 and 97b8ad1

System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 31.0.15.4633) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

Issue description

Regression from #84974 (most likely)

When I open my project in beta3 and then in a master dev build, Godot will reimport lots of files, which is then followed by scene group update. I suspect it's the same issue as #92911, because it affects only some files. However the PR linked to that issue does not fix this one for some reason, so import timestamps seem to work differently. Thus not sure if the issue is Windows-specific too.

EDIT:
After further testing, it stops happening after, like 10 reimports (tested with #74830 applied).

EDIT2:
Also to clarify, this issue only affects users that use dev builds, so it's not a major regression. Jumping between official builds doesn't have this problem.

Steps to reproduce

1. Open the attached project in beta3
2. Open the project in master dev build

Minimal reproduction project (MRP)

reim.zip

[KoBeWi]

Seems like #74830 no longer works, so it's the same issue as #92911. #84974 just made it more annoying.