Hope this will help futur people,
But gsync seems to be broken on fresh install 24h2 or 25h2.
Why ?
I was struggling so hard to make gsync functional again :
The only way it was running is the pendulum demo and my hardware is gsync capable by the way !
==> I just fresh installed an old version of windows (23h2) and everything is back to normal!
Vrr is capable again and I am so happy
Seems to be a problem with the swap chain both 24h2 and 25h2 use anymore.
I also contacted Nvidia and Asus but they are struggling so hard to pint out the problem.
Easy solution,
Roll back !
