[Gameplay] Tahm Kench W doesn't shoot minion when reactivated/makes minion unkillable

After playing several games with Tahm, I've found that when you use his Q/W combo on a minion, several bugs can occur. As far as I can tell all of them occur when 'W' is hit again too quickly.

The most common bug results in the minion simply being placed next to you without it causing the AOE effect, nor dealing damage to the minion itself. This seems to be a case of the W being reactivated before you actually have anything in your mouth to fire. This happens to me pretty much every game, sometimes multiple times a game, but this may simply be me getting to quick on the draw though.

Less common is that I will fully eat a minion, but not be able to reactivate his W again, and have to wait for the ability to timeout and automatically spit the minion out. This has happened to me about 4-5 times and is much less common than the first bug, only happening in about 1/3 or 4 games.

The last bug just happened to me for the first time. I just finished playing a custom game to try out a new set of items with Tahm, and went through the normal Q/W combo. The first bug I mentioned occurred, and the minion was placed next to me. This time though, the minion became unkillable, and simply sat there at almost no health, not taking damage from my basic attacks or my minions (who were attacking it) for the better part of 5-6 seconds, afterwards simply dieing. I don't believe it was taking any damage at the time, but I could be wrong, and one of my minions could have finished it off.