[GAMEPLAY] Can't undo a buy when playing as Tryndamere

I've recently been leveling up an account and noticed after a lot of Tryndamere games (+60) that you can't UNDO a purchase if you buy an item WHILE DEAD.

Steps: 1: 1v1 the enemy Katarina and die to her ignite 2: Buy another Mortal Reminder so you got 2 of them 3: Regret you bought 2 Mortal Reminders (You are still dead) 4: Try to undo 5: Undobutton is grey and cannot be clicked 6: Sell your 2. Mortal Reminder 7: Cry in a corner

Reproducable: Like 90-100% of the time. My account name is Mortal Reminder (yes like the item) and is level 23 on the EUW server. Last occurance happened in: THIS GAME - shows match history and timestamps