There were some info on it back when it premiered in Forspoken and Immortals:I got nasty frame pacing with frame generation on. Lots of frame flickering while looking around. It's probably just my setup, but it's only when I enable FG. Monitor frequency reading does crazy acrobatics while it's on. RTX 4060 Ti. v537.42 and v546.29 drivers tested. I'll add another peanut gallery comment if I figure it out.
So it looks like that pattern is normal, but maybe it's outdated. When I'm using it and Radeon overlay frametimes are normal.
Probably you would need to test different Vsync options, on/off, gsync on off etc