Hi @Fabian just noticed that in some cases when a note with a video is quoted with another video, and when this is started, both start playing. Same issue when you hit that note for separate view, the other video continues playing in the background (current public iOS version). Cheers!🍻 
https://video.nostr.build/c26f558a6b9d929b77abfc7c15f20a2d3da1aeff29489d6925e8773250253010.mp4 

 Noted