"Invalid Move" loss

[Tech-Expert-Wizard]

Another issue on "Invalid Move" loss was mentioned in #956, but it seems to be different. Exact URL where the bug happened I've seen several examples of games where one player lost because of this bug, e.g. https://www.pychess.org/8RTrB4Jf and https://www.pychess.org/jwNGFnfC and https://www.pychess.org/fA5Y8hLE Steps to reproduce the bug Click to a previous move during a tourney game. The bug seems to only happen during tournaments. I tested with a normal, non-tourney game and the bug doesn't occur. What did you expect to happen? The game should've proceeded normally. What happened instead? The player who clicked to a previous move during a tourney game lost by "Invalid move." Operating system and browser version Windows 10 and Firefox 102 (for the kyoto shogi game that I lost because of this bug; I don't know what OS or browser the other players are using), but I don't think this is relevant. It seems more like a server-side issue.