SCREEN TEARING ON 360HZ GSYNC MONITOR (Overwatch)

[Roy]

so a month ago I bought the new Asus pg259qn monitor (360hz gsync one)
everything worked fine on 400 fps in game, smooth and no screen tearing.

today when I tried on practice range, I noticed screen tearing on 400 fps (no drops) on full screen.
when I cap it to 300 fps, everything works fine.
I assume its because the moment I cap it to 300, gsync do the job.
but I wonder why when I run the game at my refresh rate (even if its a custom 400 fps option or display based) I get screen tearing? never had it before.
even when I had 240hz monitor and I went 300 FPS - I didnt have tearing at all.

My Nvidia driver is up to date -> I rollback the driver to an older one (the one I had before the issue) -> it didnt fix it.
I unninstalled Nvidia driver with DDU - reinstalled windows - > installed the newst Nvidia driver - didnt fix.
Gsync works in the nvidia control panel, cable is on DP, 360hz selected in Windows and Nvidia control panel. 360hz also selected in Overwatch.
on my Nvidia settings I leave it on - let the application decide, I never had an issue with it so I leave it like that.
Vsync in game fix the problem - but its not a solution for me as it adds input lag.
I wonder if the problem is Windows update, Nvidia GPU driver, Overwatch update… what can cause it?
I didnt have this problem before, anyone knows what can be the issue?

[sharknice]

Unless you turn on vsync once you go over 360 fps you'll get tearing. Cap it at 355 and you'll be fine.