I have made several tests and based on these I suspect it is a KDE6 issue. 1. It is present with kernels down to 6.2 (older kernels would require an mkinitrd I could not install) 2. It is not present in latest openSUSE Leap live iso, which is on KDE5 and kernel 5.14 3. It is present in Kubuntu, but not present in Ubuntu. Therefore I think it is probably a KDE6 bug.