I was finally able to test this issue on new shiny hardware
Using the pre-installed macOS 12.01 I could easily reproduce this issue on a 14” MBP M1 Pro, where the screen is cut off. But: After I updated to macOS 12.1 the issue is no longer reproducible. It seems like Apple managed to fix this already on their side.
Could you please check, if this bug is also fixed for you after updating to macOS 12.1?