Tahm Kench Gameplay Bug

When playing a game as Tahm Kench, I was getting told by my team to ult into lane, even though I had just used my ult to get to a lane to farm.

When playing on the same team as Tahm Kench his ult will constantly say that it is available for casting in allied summoner's HUD whereas in Kench's it will still say that your ult is on cooldown.

So to summarize, the issue is that when playing on the same team as Tahm Kench, you will constantly see his ult as being available for casting even if you just watched it go off.