Same issue with AMD cards as well. Got a new monitor (21:9 1440p 100hz) a few days ago just like the last poster and the loading screens have really bad flicker. Flicker is apparent in-game around 60 fps, as well. Freesync range on the monitor is 48-100hz.
Graphics Card: XFX Radeon RX580
Driver Version: 20.12.1
Monitor: Westinghouse WC34PX9019
Freesync