Oh, it might look like a minor issue, but you never know. It may have rippling effects.
For instance, if the target is a spell caster currently Concentrating on a spell, the fact that the game seems to consider Eldricht Blast With Agonising Blast as two sources of damage (at least, that's how I read the combat log you captured), then the target might have to do a Concentration Saving Throw twice. And I don't think I need to explain how this messes with balance ...
