I hoped to see a more solid answer because I caused a (I think) similar thing to happen on a friend's MacBook a couple years ago.
I think I was using some utility to force the resolution down from retina levels for some emulated game we wanted to play. Something went wrong and the top ~1/5 of the screen started flickering insanely quickly.
We restarted the laptop and the flickering continued. Then I think we turned it off, left it off for a while, then turned it back on. Still flickering.
In the end we left the laptop on for a couple hours and it slowly became less flickery until it was eventually entirely back to normal.
Super weird. I was so confused and my friend was so nice about it all that I didn't even think to take a video or document any exact stuff we tried aha.
I think I was using some utility to force the resolution down from retina levels for some emulated game we wanted to play. Something went wrong and the top ~1/5 of the screen started flickering insanely quickly.
We restarted the laptop and the flickering continued. Then I think we turned it off, left it off for a while, then turned it back on. Still flickering.
In the end we left the laptop on for a couple hours and it slowly became less flickery until it was eventually entirely back to normal.
Super weird. I was so confused and my friend was so nice about it all that I didn't even think to take a video or document any exact stuff we tried aha.