[Mobile app] Resigning a Tactic Puzzle

A few days ago there has been a UI update for tactic puzzles on the mobile app. It looks nice, but there seems to be one issue: The "Resign" button right under "Your turn! Find the best move for white" vanishes if I make a mistake. I do not see any other way of resigning. Thank you for looking into it.

BTW: I am not signed in, for the case that this makes a difference.

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