fractional Vsync no longer works in DX12 titles

[ShodanCat]

choosing a fractional Vsync setting (1/2, 1/3, 1/4) is no longer being applied to DX12 titles.

this started with a recent Nvidia driver update (possibly 560.94) but it may be something inspector can 'fix' by using a different flag or something shrug but i figured i'd bring it up because it's a very useful feature.