iPad: Post-Annotator. Website gets unresponsive on video start

I was testing the post-annotator on iPad. I realised that as soon as I start a video the whole website gets unresponsive and I hat to force quit safari to stop the sound from the iPad.

@christian.hansen can you check if you have the same behavior on your iPad?

Platform: iPad, iOS: latest, Browser: Safari / Brave

But I don't get any error in the console...