In Chromium, the video player immediately pauses on playback, or plays but fails to pause. In DevTools the console was logging data from player.js - disabling JavaScript seems to fix the issue - although a downside of this is that hotkeys and the quality selector don't work.
Thus, this seems like a bug in player.js.
Tested on Chromium v103.0.5060.134 and Brave (Chromium v103.0.5060.134)
I think this is a duplicate of #7 - you can close this ticket.