Hello !
Thank you for testing.
I am testing monitors for myself, having the M28U a few days ago and now the FI32U.
Both seem to have an issue with colors getting lost and only show black/white in a few frames while gaming.
After reading your update regarding HDMI 2.1 limited to 24Gbps, causing it to use DSC for DP and HDMI as well, I wonder if its related to DSC implementation in Gigabytes software?
I made a video of it, showing the problem on a M28U. Of course I tested several cables, settings, monitors, PCโs, and so on.