Screen flickers on PRIME monitor about every 10-20 seconds

I almost finished ironing out all the issues with the NVidia driver, but one remains. The screen on the laptop flickers all 10-20 seconds. On the external monitor everything works fine. I can see that this has been reported a few times in the past already. In the end, it gets solved by a driver update to then reappear again a few months later.

I have driver version 470.63.

Please let me know if you need any logs!

My xorg.conf

Section "OutputClass"
    Identifier  "intel"
    MatchDriver "i915"
    Driver      "modesetting"

Section "OutputClass"
    Identifier  "nvidia"
    MatchDriver "nvidia-drm"
    Driver      "nvidia"
    Option      "AllowEmptyInitialConfiguration"
    Option      "PrimaryGPU"  "yes"
    Option         "metamodes" "DP-0.1: nvidia-auto-select +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On, AllowGSYNC=Off}, DP-0.2: nvidia-auto-select +2560+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On, AllowGSYNC=Off}"
    ModulePath  "/usr/lib/nvidia/xorg"
    ModulePath  "/usr/lib/xorg/modules"

PRIME sync is enabled.