With metal, when tilting iPhone between portrait and landscape, the screen regularly flashes black during the tilt

With 7.0.247 and metal active, on iPhone 15 pro max with iOS 26.5, when tilting the phone between portrait and landscape the screen often flashes black which breaks the illusion that the screen transforms smoothly between the two layouts. 

It seems to happen quite consistently if I wait around 10 seconds before tilting, maybe there some kind of internal refresh cycle?