MacBook Pro (16-inch, 2019) + ZMUIPNG dock same problem. Started happening after update to BigSur. I'm currently on 11.3, so based on previous comment likely I'll not get problem resolved on 11.3.1 :( This is my first ever MacBook, guess what is my impression right now
zskii
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All it takes to run into this issue is turn monitor off then on, don't even need to disconnect any cables
@DelGurth mine has AMD Radeon Pro 5300M 4 GB yes