Undo request during Black Market buy

[Picon]

If I press "undo" when the Black Market buy interface is on, I am still getting a prompt to buy a card, but I don't see the card selection, so I am forced to click "Don't Buy". Technically, an undo request at that point (when playing black market but before buying a card) should be invalid, since new information has just been revealed.

[singletee]

As a workaround until this gets fixed, you can type /undo in the chat window, then click the place in the log that you want to return to.

[tufftaeh]

Or you can request Undo several times until you are at the situation before playing the Black Market.
(This is faster with bots but less convenient for human opponents.)