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Computer analysis finding mate quite slowly

I recently played this game: en.lichess.org/9S6kvDYs/white#36

On move 18, my opponent blundered by playing ...gxh3. This leads to a mate in 11 (assuming perfect defense). However, stockfish didn't find that mate. It just suggested 19: Nb5+ as the best move.
Funny thing is, after 19: Nb5+, stockfish almost instantly finds the mate in 10 from there.

I had to put the search mode on "infinite analysis", and only after 25 moves did stockfish find the mate in 11. How does that work?

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