SUMMARY When renaming a file in a folder containment which has a custom position, it will be repositioned after Plasma restart to the first free position in the topleft ordering. STEPS TO REPRODUCE 1. Move a file to a random position, e.g. bottom-right. 2. Rename the file, e.g. via context menu. 3. Restart Plasma OBSERVED RESULT File is moved to first free position in the normal ordering. EXPECTED RESULT File keeps it position.
Fixes things for me: https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/2320
Can reproduce.