I am playing in a fabric server, which installed carpet mod and some other survival-assisting mods and plugins. (malilib mods, carpet, offline login plugins, anti-cheat plugins, set home plugins...) I cannot provide an accurate list of all mods and plugins and their versions because I am not the owner of the server.

The problem I encountered is follows: I used /player <my name> shadow to AFK at an XP farm. But when I logged in again, I couldn't log on and the screen said "Invalid player data".

When I switched to another account and logged in, I found that no matter whether I used /player <my name> kill or used 啊weapon to kill the "shadow", the text box showed ' left the game', but then it immediately showed up at the previous location again and continued going through the motions. Now somebody pushed the 'shadow' into the void so it kept "dying".

I am contacting the owner to get the mod lists and the server log, but right now I can't provide them. Is it possible to tell what is the possible cause? Thank you