There have been tons of display issues especially with the M1 Mac Minis. I honestly expect a lot of them to be resolved (if possible) in 11.2. Apple even called

There have been tons of display issues especially with the M1 Mac Minis. I honestly expect a lot of them to be resolved (if possible) in 11.2. Apple even called me directly so they could understand my problem better even though I had returned my Mac Mini. I'm confident they're on it.