While using deadbeef i notices that you cannot add .opus files, unless you go to ffmpeg plugin and manually add the .opus extension. It is something similar to this:
https://github.com/DeaDBeeF-Player/deadbeef/issues/1779
Another issue that I have is when i try to convert any audio file to opus it wont write the tags and i'll get the "Failed to write ogg metadata" error, just like this:
https://github.com/DeaDBeeF-Player/deadbeef/issues/2001
Both of this issues are supposed to be fixed already and as a matter of fact, they are not present in my debian machine.