Sorry for the late reply but this is the console (when the black screen appeared):
video_open failed. User must interact with the page before video with audio can be played. Attempting to play the video muted runner.js:44 Adding unmute listener runner.js:45 Done unmute listener index.html:1 Uncaught (in promise) AbortError: The play() request was interrupted by a call to pause(). runner.js:45 Calling onvideoframeupdate 2 index.html:753 focuscb:::blur event received Pause event has been registered for this frame
the AbortError was in red and linked to: https://developer.chrome.com/blog/play-request-was-interrupted