I used the Kate AppImage several times on a distant shared server. The admin of the server just contacted me to signal stalled dirs in
/tmp with names of the form
.mount_Kate-xjl6a8b. He was not able to remove them even as root. After searching, we found that we were able to force unmount them and manually remove the dirs.
I suspect that unexpected disconnects killed some instances of the app and left that behind. If it is the case, I consider that it is a bug (A failed X session should not abandon files or processes behind, furthermore if not accessible) but from what ? Kate, the AppImage, the filesystem, … ?
What do you think ? And is it the good place to report this problem ?