I would say it’s words that actually do not mean anything “not stable”
I tried rebooting many times to new kernel in a row and sometimes it will simply not load initramfs even with that new set of parameters. So kind of lottery at the end.
Looks like some timing somewhere
Edit:
From cold boot I was unable to boot straight into 6.12+ but when I boot 6.1 and then soft reboot into 6.12 it works.
@sudrien whats your experience?