Energized empowered AAs not functioning correctly

Situation: A melee champion with an empowered AA attacks with Rapid Firecannon.

Expected outcome: The attack gains range and is applied as normal.

Bug: If the attack is empowered, RFC will deal its damage, but without the AA animation, and actually cancels the auto attack command.

This is the case for Garen and Mordekaiser, at least. It seems to be working correctly for Hecarim.

I know you shouldn't buy it on them, but that doesn't mean it shouldn't work properly.