master Yi heal

Just came out of a game where a Yi was reducing tower shot damage after coming out of a Q, yes tower refocused him but didn't apply appropriate damage even if it does reset the stacks. His heal isn't supposed to reduce tower damage as well anymore yet the entire game right before a shot would hit him he would use his heal to reduce the damage of a tower to a mere 50-100 at lvl 4! I thought this whole problem of Yi tower diving and then just restoring his health back to full while under the tower was fixed.

I can only assume this is an exploitable bug because it not only reduced the damage, it cancelled its attack or the tower range in the game was severely reduced because after he did that the first time the towers wouldn't fire while he was in range. Please fix this bug asap so that people aren't tower dove for free at lvl 4 while on to pof their tower by a yi that abuses this bug.