[BUG] Android; Lessons disappear from playlist immediately after importing

Hello, when I drag lessons to the playlist on my Android, it disappears from the playlist after a very short time.

When I create a new playlist, everything works again for a certain time, until the playlist is again “not working” or broken and another new playlist must be made. (My playlists are not full, only 5-10 lessons each).

I can always see the lesson in the respective playlist briefly and also how it disappears.

Can anyone help further? Thanks a lot!

Strange, we will look into it.