I have this ghosting issue too. A bunch of us have been trying to get to the bottom of it here: https://forums.macrumors.com/threads/m1-air-ghosting-flickering-

I have this ghosting issue too. A bunch of us have been trying to get to the bottom of it here: https://forums.macrumors.com/threads/m1-air-ghosting-flickering-with-external-display.2271670/ https://forums.macrumors.com/threads/m1-air-ghosting-flicker... – It only affects M1 Macs, and seems to be unrelated to the brand of display. No replicable solution found so far. Incredibly annoying.