Puzzle bug?

In this puzzle i castled long on first move, but nothing happens then that i could go ahead.

lichess.org/training/67517

It seems like it isn't just you. I got the same result from the same move.

Ok thanks

Thanks for reporting. Fixed (github.com/ornicar/lila/commit/15d72da59b04214109241120e84882418e1c0fb5).