[GAMEPLAY] Rapid Fire Cannon stops working on melee units in TFT

If you equip a melee unit i.e Kassadin, Volibear etc. with Rapid Fire Cannon in TFT it will work for one round, your melee units will be able to hit from 2 units away, and then stop working on future rounds reverting them back to basic melee. I've tried building RFC on 3 separate units and the problem happens on all 3 (Volibear, Kassadin and Sejuani) consistently (Tried on all 3 in 3 different games).

EDIT: This also appears to happen on ranged units, RFC in general seems to bug out after one round.