It's late and I haven't taken the time to investigate but I am assuming some of the nids changed (or some nids were added).
My memory on the subject is very fuzzy... I'll try to run a debug version later this week, but maybe it's time for us to give grandpa an update?
I tried with rev 113, which, as far as I know, was running fine on 6.39
Edit: renaming libs_63x into libs_66x to override libs_6xx didn't help, different type of crash at the same step...
more when I run a debug version.