Thanks Markus for contacting me.
I’ve created the thread:
https://forums.developer.nvidia.com/t/pixelated-dof-on-ue-5-5-5-6-with-latest-nvidia-drivers/354500
I shared a render and I think if you do any render with 5.5 or 5.6 (and latest drivers) in which there is a significant DOF with movement you can reproduce the issue. I also shared the threat on UE forums.
If you cannot replicate the issue please let me know, I will recreate, create and share a demo project with you.
In the meantime I think others may contribute.
Regards,