When taking screenshots on replay mode (with the included screenshot mode), there’s a very high probability of getting a small square on top left of the picture which has a different color from the one that it should be. This has happened to many times. Note that it doesn’t happen to every screenshot, just in some of them.
My settings are all to the highest
Device: iPhone 13 Mini
Operating system: iOS 15.5
This is how it looks:
