Steam Flickering in BPM (BigPictureMode)

Hi, i have read all the Threads, but can´t find the right solution. When i start "bazzite V.42" After fresh install, the BPM (BigPictureMode) is Flickering as Hell. i´ dont have the problems when i activated HDR, but thats look blurry.

i have tried VRR in Desktop Mode on "Never"
i have tried 60HZ

nothing helps so far.

Thx for your help,

Alex