Well I know as much (and I beleive you tested this as well) that Karas can’t use his counter super as a response to a VC, for example.
VC actually removes your character’s hurtbox altogether, so your opponents moves whiff when you’re in a VC state. Specials can be cancelled into as normal, but supers seem to be a no-no. It’s kind of weird.
This game allows you to cancel into special moves even if you whiffed your attack, and since when you’re attacking a VC opponent you’re just whiffing them, there’s no reason why you wouldn’t be able to cancel into a special.