Youtube not playing playlist


I’m facing a problem with the youtube extension which seems not usable at the moment. Since I am new I wasn’t able to get it working yet so bear with me.
From what I gathered from github the search function is currently broken due to a pip update. So I tried adding a playlist to test if it works at all.
From using the test youtube link provided by the extension install site I get the error :

ERROR GStreamer error: Could not determine type of stream.
I just put a file named playlist.m3u which containes yt:yt: (thats the provided example) in my music folder. Somehow even the local scan doesnt want to add it to playlists.

I’m a bit lost as to what I’m doing wrong…