Tried all work arounds from Big Sur Flicker.  I was previously working under that one but then saw a video of what was meant by flicker.  Mine is a slow flicker like windows is trying to constantly redraw because of a change in resolution.  Latest version latest VM hardware.  Today it stopped flickering logged my out of the windows CM and decided to stick with XGA on a 4K monitor.  So Restarting the VM.  Only time I have seen this kind of behaviour was in Fusion and I believe it ended up being a memory leak.