How did I win against Stockfish level 8?

Hello, I was playing against Stockfish level 8 in a hyperbullet game of Horde. At the end of the game Stockfish didn't move and it losts his six seconds remaining. I was sure that I was going to loose, after the game I checked it with the analysis and I saw that Stockfish could win in six moves. What happened? Is this a Lichess' bug?

Please answer me!

@Tentagleman Stockfish cannot capture en-passant in variants (this is true in anti but idk about here)

Ok but how does it explain the reason because it has lost?

If en passent shows up, it stops playing. It is a lichess bug.

Why can’t stockfish play other moves instead of en passant

See this. Stockfish can't en-pass; this is antichess.