I am also having issues with playlists in the deovr app. I have premium and a Quest 3.
When I add videos in Deovr to "Watch later", "Liked videos" or any of my playlists they don't show up. If I then view the playlists on the website the videos are there.
If I create a new playlist in Deovr and save a video, the playlist appears empty and it says "No videos found. Try changing search conditions." However I can't find any options to change the conditions. Again, the video is viewable in the new playlist via the website.
I have deleted my cache, deleted and reinstalled the deovr app multiple times in the last 24 hours and no change.