Frame Generation option gives input delay on VSync On with high frame rate limit

Edit1:Somehow turning on VSync AND limiting frame rate limit to 30 fps makes the input delay almost gone (when on 60 fps), while the fps is limited to 60

Edit2: Setting frame limit to 0 with vsync on also makes input delay

Seems like the issue below happened when i try limit frame rate on 120 fps on the option
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When using the new Frame generations (amd) option, it gives significant input delay the lower the fps go, the input seems to be working nicely around 90-120 fps on a 75hz monitor, but need to turn off VSync

input delay also affected on turning on VSync with 75 fps on 75hz monitor