Til21 🇩🇪 this is an excellent video that finally captures what is transporting.
It’s not a display issue as hardware overlays are diabled when the Appswitcher is employ and it’s full GPU being used.
This is identical to Disable Hardware Overlays in developer options.
It’s probably SurfaceFlinger/HAL not being optimised.
Personally, I don’t care and if I cared I would simply Disable Hardway Overlays in Developer Options.