I'm experiencing a similar issue. It's not measured with Afterburner so it's not exact, but I feel stuttering when the screen rotates quickly. However, I get the same symptoms even when I turn off frame generation, so I'm not sure if it's the same problem.
The most prominent issue I'm experiencing with frame generation is when I respawn after dying, the screen freezes momentarily. I also get the same symptom in Hitman 3 when I pause and then unpause the game (it's been years and it still hasn't been fixed. The strange thing is, older versions didn't have this problem. Why is that?). I suspect it might be the same issue, but I'm not sure if it will be resolved here.