For those who also are affected with Boot-Problems like "Loading initial ramdisk ...".
grub2-mkconfig -o /boot/grub2/grub.cfg
Reboot, Select the Old-Kernel, Reboot again to check if it is holding
multiversion.kernels = latest,latest-1,latest-2,5.3.18-150300.59.76.1,running
I think this will work as described... Not versed with Suse :)
I also added an Lock even though i'm not really certain if it is the same as
apt-mark hold ..
zypper addlock --comment "NEW KERNEL IS BUGGY" kernel-default-5.3.18-150300.59.76.1.x86_64