Mcpe black black flickering on screen.

Black flickering from the side of the screen to the other side, rapidly.

Cannot take screenshot or record screen since it somehow, doesn't show when
I try to capture it. Screenshot doesn't detect it as part of the screen.

I am playing on mobile, so the screen is on portrait mode and it seems to happen more frequently when I scroll.
Does not happen in game.

I don't have any shader packs active and I deleted addons that I thought might cause the problem but it still happens.
This has started quit a few versions back. Happened since I joined beta.

I don't know if this might be due to a bad file somewhere that misbehaves.

Regards
Ruann