Some Lemmy instances, including lemmy.world, are misconfigured for video/audio streaming. If the video is hosted on one of those instances, that could be the reason.

https://aeharding.github.io/lemmy-streaming/

Noticed that on my end too

Today it updated and it started happening to me too, not only I can’t seek, the mute and pause buttons don’t work either. It’s like once in full screen the whole interface can’t be touched.

While on the feed: I can unmute.

On full screen: the controls related to the video don’t work, the others (close, up/down vote, open comments, etc) work fine.

Came here looking to see if anyone else had this issue. Glad I’m not alone