If nobody’s posted them as bugs then the devs probably won’t have them on their internal tracker.
Cosmic Impact isn’t a subskill, it’s a modifier to the base skill. Generally anywhere a skill node says it applies to the skill (which is ~99.9% of cases) it applies to sub-skill that procs as well. Otherwise ailments wouldn’t inherit any damage from the proccing skill.
There’s nothing in the node that says it should only apply to the preceding node (Cosmic Impact) since it says “Devouring Orb hits”.
Edit: here’s the patch notes when they changed it:
Which is why I’m saying it’s not a bug. Though I’ll agree that the nodes that refer to hits need to be tightened up, since the descriptive text says hits but the modifier text doesn’t.