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Problem 66603

So I solve the puzzle fine, but when I play the final move, b8=Q, I cannot promote. The interface just hangs. Why is this. Eventually I fail the puzzle. Annoying.
I have just experienced the same thing with training problem 68289. After I push a pawn to the last rank, instead of asking me which piece I want, the board freezes. A browser refresh reloads the training problem at the start. When I make the same moves, it freezes again. I have tried opening another browser window and reloading the puzzle, but no effect.
Thanks to you all. lichess, can you look into this please?

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