The shop in-game, while dead, cant always undo a purchase you just made.

A few times, have have made a purchase while dead or at base/fountain, (various different items) and i've been unable to click on (undo) even while im still dead, like a few seconds later. it happened for a while with 3rd tier boots, once you upgraded them, there was no undoing it at all. for every boot, for every final upgrade. i haven't looked to see if that one still exists, but 4 times in the last couple weeks, i have bought an item, later, while still dead from the same death that i purchased them, and changed my mind and tried to undo, and the undo bar has been grey, or not "popped out" like i cant click on it, but i can sell it, but then i lose gold. Thank you in advance for resolving. Sorry, wish I could give more specific instances on when it happens and with which items, but it happens in game, i get frustrated, and after the game, i just dont remember the specifics, just that it happened and it was frustrating haha