FileSystem Does Not Behave Properly During Rescanning

[nongvantinh]

Tested versions

Current master at commit: 9b94c80

System information

Windows 11

Issue description

I'm in the process of implementing proposal 5633, and this error is occurring. It seems that during the rescan process, threading is not working correctly. This issue only occurs when there are more than two files being renamed.

Here is the error message, but it is not the root cause. There seems to be an issue with threading; that's all I know so far:

editor\editor_file_system.cpp:1710 - Condition "packed_scene.is_null()" is true. Returning: HashSet<StringName>()

Steps to reproduce

FileSystem.Does.Not.Behave.Properly.During.Rescanning.mp4

Look at the modified time of these files; the modification dates of the last two selected files have reverted back to several days ago.

Minimal reproduction project (MRP)

Please test with this PR: #89063

[nongvantinh]

It seems like a problem with caching instead. When I close the editor and reopen the project, these cached files are corrected to their correct names.