Which part of the second quote there isn't true? Do "delayed" and "frozen" have different mechanics, or do frozen Rays of Light not generate ?
Both. Frozen is indeed different. For example it allows for insta-kill with shock waves. And Yes, Rays don't generate
.
I have doubt, that this is a bug. But correct me please, if I'm wrong.
Sadly, there is no pattern here. It was most likely not planned with a general rule to begin with.
Add Adrenaline to the list. Some passive skills work with all attacks, while some are triggered only on the first and last turn.
So no, this is not a bug. It's a part of the game that is not user friendly.