I'm having the same issue. screen is either flickering or having artefacts at the bottom of the screen. I noticed that when i have high CPU usage.
Big Sur 11.3.1 (20E241)
MacBook Pro (15-inch, 2017)
2.9 GHz Quad-Core Intel Core i7
16 GB 2133 MHz LPDDR3
sonique6784
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From
Sydney, NSW, Australie