If you add a new movie file to an exist media file in your movie library. Then update it on your Media Server.
Then navigate to that movie in the Discovery > Movie Library > All Movies Section.
The GUI will try to load the new metadata/file and cause the GUI to back out and shoot to the top of the List. It says Loading before it does this. ( quickly )
Make sure the video file you are updating isn’t at the top of the list to reproduce this bug.