Sometimes, Stockfish will not work for practice.

[TBestLittleHelper]

1. Follow a link to the lesson https://lichess.org/practice/basic-tactics/the-skewer/tuoBxVE5/3XsebZQb
2. ( Stockfish is not on/working). Make a move.
3. Since SF is not working, the opponent never moves and you are stuck.

Note : Maybe permission related? I have not been able to reproduce as anon.
Note : Sometimes, in the title, since often it works. But at least there is console errors in this issue.

[kraktus]

which browser do you use? And which engine have you selected? Does it still happen?

For now I cannot reproduce (testing on Safari).

[TBestLittleHelper]

Chrome and sf 16 40 mb on win11.

It has happened more then once, but I don't know how to reproduce it either. Usually, I look at practice due to a forum report about a practice not working ( ie : https://lichess.org/forum/lichess-feedback/getting-told-to-restart-a-practice-then-on-playing-the-same-moves-i-get-success#6 ) So maybe interacting with the underlaying study matters somehow. But a theory I can't prove is maybe not worth much.

[Carbrex]

I could reproduce it in first 2-3 tries but couldn't reproduce on subsequent tries. Chrome v124, win 11 and sf 16 7MB