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Problem 1923 is flawed

It marks an alternative mate in an equal amount of moves as wrong, i believe.
This isn't a useful report. What alternative? Why should it be marked wrong?

Can't rely on other people to do all the hard work for you.
Why not put the position into SF and play your "alternative" line against it?

I played the puzzle in question and see a mate in five:

1.h6 d3+
2.Kc3 Rg8
3.hxg7+ Rxg7
4.d8=Q+ Be8
5.Qxe8#

Looking something like this?
well, now i see my mate is indeed one move longer:
1. h6 d3+
2. Kc3 Rg8
3. Bxg7+ Rxg7
4. d8=Q+ Be8
5. Qxe8+ Rg8
6. Qxg8#
Fair enough, one move longer, but thats enough to be marked as wrong? Mate is mate.

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