I'm using the Mac mini M1 - 16GB computer for a while now and it seems to be making the same problem when exporting in H.264.
Most of the times my exports turn out fine, but from time to time they are broken, as you can see in the picture. I have no explanation to this, since I've been using the same settings for export on my PC (using the same footage) and everything was fine. Am I missing something here?
The strange thing is that I tried to export 3 times in a row the same sequence with the same settings, the first two were having this problem, the third turned out fine.
Please try and let us know how it goes in the beta build. If you still see this issue in beta builds, please share your original footage & export settings. We will check it at our end and take quick action.