I would switch to the Nvidia-kmp from Nvidia Repo:
zypper dup --allow-vendor-change --auto-agree-with-licenses --from https://download.nvidia.com/opensuse/leap/15.6
Because highest Version of the open-kmp is:
nvidia-open-driver-G06-signed-kmp-default | Paket | 570.172.08_k6.4.0_150600.21-150600.3.56.2
but in the Repo is also the highest Version:
i+ | nvidia-driver-G06-kmp-default | Paket | 580.82.07_k6.4.0_150600.21-lp156.39.1
After this, before you restart, post:
zypper se -si nvidia