Bug in the study. Not accepting certain moves and not importing/exporting pgns correctly.

I was building out an opening tree, and I reached a point where it wouldn't let me add any new moves. When I made a new move, it would change the board to a different position that I had in that chapter. I tried creating a new chapter and recreating that line of the original chapter. No difference when I got to the move that was causing problems. I tried this again in a new study. No difference.

Also, the pgn was either not exporting or not importing correctly because when I tried recreating the chapter in that way, many variations were missing.

Just to say that I've been having the same issue. Studies are now unavailable so hopefully the lichess team are aware and fixing it - thanks in advance.

I'm having similar issues with my studies, let's hope the Lichess team is aware of these issues.

Lichess study is down?

We are aware of the situation, our developers are working on it