@pali and fmg
Thanks, sounds reasonable. As I have some other strange behaviours (USB does not get recognized, but I need to unload g_file_storage once manually) and now this and those strange optfs too low messages, I decoded to start all over with a backup from July and upgrade one more time.
One beg: does anybody have the mkfs command for optfs? I am gonna clean optfs on rescue shell and then restore backup. Or is it just a plain mkfs? Thinking about some root reserved clusters, naming and so on ...