FOSS gamedev and creative worlds

I'm developing a mods working with generated map and suddenly maps ...

Strangely, the supposed block(-32,1,63) is on the screen (over the water). But I do not see anything and do not understand what happened.
Despite many error messages on console, the server has not stopped working. But I freaked out about it.

Multiply these coordinates by 16, teleport there and you'll see many dropped items or mobs.

\o/ Post #3333

GG