doesn't matter if legitimate or alternative, my point is, some apps have their brightness controll that can mess mess with your adaptive settings. in most app try swiping on and down during video play to see if it controller the light, if it does, then turn off your own adaptive. brightness
this has worked for many in the last.
if you'd like se trouble shooting I'd be happy to assist.
oh joy, well I hope the double tap works then because otherwise I guess I'll have the same issue too then. I've bookmarked this to see what the outcome is of that double tap. I can think of a few people I'd like to double tap but that's another matter 😎