Undo in the middle of a Lord Rat turn seems to hang the game

[tufftaeh]

game #328179 on frankfurt:
I clicked Undo in the middle of a Lord Rat turn (log said he just drew a card with Magpie, didn't show the reveal yet). Instead of going back to my previous turn (optimistic, I know) the game hung with "Waiting for Lord Rattington." Refresh and Login brought me back to after the same (complete) turn of Lord Rat, and I could continue from there, even with /Undo back to where I wanted to go.