Couldn't eat Kai'sa cost me game (Tahm Kench bug)

No matter what was happening or what point of the game we were in I could not eat my adc. She was very fed on Kai'sa and the fact that I couldn't W her to protect her cost me the game and the LP to put me in diamond promos. This is actually the most bullshit I've ever experienced in this game and from the looks of it this bug has been going on for a very long time. Fix your game and maybe people will stop migrating to Fortnite.