rAudio 20260801 + UPDATE 250805: Annoying change in thumbnail creation #2150

This is a continuation of my previous thread #2146 (20260801: No more thumbnail generation).

Problem: rAudio generates thumbnails now even in places where no folder.jpg is present.

Example:
This is my subtree "Brahms, Johannes" containing many albums down the four genres:

All albums contain thumbnails.

Performing an "Update thumbnails"->"Only added or removed" in "Ein deutsches Requiem" shouldn't find anything to do, but:

rAudio generates thumbnails in "Ein deutsches Requiem" using the first work found inside.