I just checked contents of two directories and there is a difference,
-rw-r--r-- 1 user user 601M Dec 15 2024 /path/to/file/filename.sync-conflict-20250815-060105-XXXXXXX.mp4
This file is only available on working server.
Although it has been created prior to creating this new folder months ago, I’m not sure if this could be related.
$ cat /path/to/.stfolder/syncthing-folder-1234567.txt
# This directory is a Syncthing folder marker.
# Do not delete.
folderID: aaaaa-bbbbb
created: 2024-12-17T15:29:09+03:30