I have a Fedora 35 server that was running in a Virtual Box VM. I upgraded VB to 6.1.36 today and now the Fedora 35 VM aborted on starting. I also did a Fedora upgrade today so not sure if it may have been that upgrade that is causing the problem.
It would appear to be a VB problem as I restored an earlier working version of the VM and the result was the same. Right after the grub menu, it would abort.