How is this not mate?

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Avatar of DrDidi147
I played white and after pawn f2 to f4. my opponent couldn't move and I won by time-out but I fail to see how this is not checkmate. Chatgpt told me black queen could take my pawn on f4...
Is this just a bug or am I missing something?

Avatar of SacrificeTheHorse

Black can capture gxf3 en passent.

Avatar of YouMissedMateIn169

En passant gxf3 (actually it takes pawn on f4), it's a quite strange rule but it's still a rule