Fail in cracking player seed

[Landigos]

I was able to get XP seed 1 and XP seed 2, but for many attempts now I cannot get player seed. Is it possible that this is due to the Pufferfish server core (Velocity). The server, however, is based on 1.17.1 but can also be accessed from some other versions (if that matters). I seem to have followed the instructions, made many attempts, but it is always at this point that I get the error.

That said, I've just tried it in a single world and it still doesn't work