Vilemaw's "Heavy Attack" doesn't hit targets that get inside of it by removing unit collision

So I was playing a game as Garen jungle (In an AI) and decided to jokingly attempt to solo Vilemaw knowing I couldn't do it. Garen's E has slightly less range than his auto attacks, making it unable to hit Vilemaw from Garen's auto attack range. Luckily, it removes unit collision, so you can walk closer to Vilemaw, as you could if you had Phantom Dancer on any champion. Apparently though this causes Vilemaw to struggle to target you

Vilemaw has 2 attacks that it uses in this clip: Light spammable attacks that successfully hit me and a heavy Braum-like attack that is unable to hit me. It seems to fire a series of shockwaves in a line, but the line starts from Vilemaw's exterior, meaning that removing unit collision allows you to dodge this.

Since there aren't many people building Phantom Dancer on 3s and fewer play Garen jungle, this isn't a major bug, but it's worth noting that it makes soloing vilemaw really easy.