puzzle error

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belfast-chess

Hi Guys,

Am i going insane and just can't see my mistake or is there a flaw in some of the tactics puzzles. Ignored others in past assuming i had been mistaken, but today i noted it.

Tactics Analysis Board: Problem #0208559

In the given answer black plays bishop to e8 where it is captured or forced away so white can promote after a few moves and win.

But black can keep his bishop, ignore the white threat and just simply push his own pawn for a promoted queen