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https://lichess.org/training/61705 - wrong solution

the official solution 21.f6 is a good move but an even better one is 21.Ne6+,Kf8 22.Ba4+,Rc6 23.f6 winning according to Stockfish 10.
The 21.Ne6+ is wrongly considered as a mistake.
@ofer

21. Ne6 has an evaluation of 0 by SF 10+ at 30/99 depth while 21. f6 has an evaluation of +4.0 at the same depth. Although 21. Ne6+ it certainly not a bad move but it's certainly not the best. It brings the question of would you rather have a winning position or a losing one.
This task is a good example to explain the importance of a tactical forum or a task force for checking the problems.

The solution ends too early for humans imo. 1.f6 Bxf6 2.Rxf6 and it is counted as solved. You should have seen 2... Rg8 3.Rh6 before the end. The last move is easy to see in the position, but you have to get feedback from the starting position in the solution imo.

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