I think we need to be able to reproduce the problem here, else it's really complex to try to "fix" anything.
As far as I've restored dozens of ims-cc packages and never have had that error, I cannot imagine any cause for it.
I think it would be 100% helpful if you could share the offending package (the original ims-cc one or the generated moodle.xml one) in some way (publicly or privately) just to be able to reproduce the problem/s.
Sure there is one bug, it's only a matter of being able to catch it
TIA and ciao!