Hi Benny!
Did you ever solve this?
I am having the same problem with a Huawei P Smart 2020.
The screen was cracked, so I replaced it. After like 5 minutes the same phenomenon as in your movie occurred. I suspected a bad screen so I send it back and had the seller replace it for another one. It is clearly a different make than the previous one but it occurs to display the same symptoms…
Cheers!