I recently bought a PG48UQ, Pretty happy except with Windows desktop HDR washed out issue.I also have an HDR TV connected on another port with no washed out HDR problem.
I edited color/Brighness settings in Nvidia CP and used HDR windows cali...
Same issue here, HDR content is broken on V29. Greys are washed out with a weird color rendering. BTW SDR seems over saturated.
I reverted to V28 which is not so great either but it is fixable adjusting digital vibrance from Nvidia panel
I tested V29 and had the same HDR weird render issue. Grey level and colors are messed up, even with calibration tools.
I reverted to V28 which is also bugged, but I can at least correct with HDR calibration tool and digital vibrance in Nvidia panel