So unless i am missing something, red boxes for nether fortress appear in singleplayer but not on a server. The boxes for a spawner appear on a server though. Is that normal?

Id say its a problem with the mod if part of it isnt working in a situation many people play with.

Please join the discord server for support in setting up your system. GitHub issues are reserved for problems with the mod, not for support requests.

Im having this issue with the mod on server and client. Spawning radius of spawners appears on server, as do slime chunks, but not the bounding box of the nether fortress. I am on 1.12.2

The mod needs to be installed on the server-side as well.