i have the same issue but only on one of my monitors. the monitor in question is a 2560x1440p 165 HZ 1 MS response freesync/Gsync this is the monitor that flickers bad with NGS. the monitor that has no flicker is a 2560x1440p 144hz 4ms response G Sync monitor. im using the 2080 Ti for reference. also to note while the game doesnt flicker on that monitor my other monitor is flickering constantly with the game open on the other monitor but the 2nd i tab out of the game the flickering stops.
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