AppImage client sometimes doesn't sync moving / deleting files to the server

[zweifeln]

I noticed that sometimes the client doesn't seem to notice when I move or delete files within a synced folder. It sometimes just doesn't sync the moving of a file to a different folder - or the deletion.
When moving files it usually just means there are in a different folder structure on the server (docker compose on a raspberry pi - version 4.1.0 ) then on my local machine (Ubuntu 24.04 with the AppImage client, Versions 3.0.3.2073 )

When deleting files locally on a synced folder, it should delete these files on the server as well. Usually that works all fine, sometimes a couple of minutes later, the client re-syncs the deleted files onto my local system again.

Anyone else noticed that behavior - or might have any idea, what might cause it?

What makes it worse: I didn't figure out a specific condition to always reproduce it. Often it all works as expected. Just sometimes it doesn't.
My take so far is, that somehow the client doesn't tell the server what files to delete, so the next sync it just re-syncs the files from the server back onto the local machine. But why doesn't it sync the file deletion?