Nemo displays files of subfolder as part of current folder

Distribution

Linux Mint 21.3 Cinnamon

Package version

6.0.2

Frequency

Always

Bug description

Nemo displays files of subfolder as part of current folder.
Note: This hints at a bunch of related (yet undiscovered) bugs, which all have this loading mechanism in common: apparently the core issue is asyncronously computing something and updating the view without checking for conflicting events in the meantime.
Issues I could imagine to be possible for the same reason are:

• skipped entries
• redundant entries
• mixing of entries
  ...

Steps to reproduce

1. Create a new folder and in it a subfolder.
2. Fill the subfolder with plenty of files which take a while to load due to their count
3. View the subfolder contents from within the main folder by opening the folder preview dropdown list
4. Close the preview while folder contents are still enumerated
5. Observe the bug: The loaded folder contents are now placed as items within the current folder instead of the dropdown preview

Expected behavior

• Any ongoing operation (like subfolder enumeration) should be aborted when the view which triggered it becomes obsolete or the computation is part of another operation which got canceled

Additional information

recording.webm

Start by reproducing the issue with a folder containing many files, then trace Nemo's asynchronous subfolder enumeration and what happens when the preview closes. Done means canceled or obsolete enumeration results no longer appear in the current folder, while the existing reproduction steps no longer show the bug.