The server was on all the snapshots until 1.16. I tried it on 1.16 and it didn't work. The ocean monument used to spawn guardians until the snapshot in which Structures were re-written.
SkullGamerRishi
The server was on all the snapshots until 1.16. I tried it on 1.16 and it didn't work. The ocean monument used to spawn guardians until the snapshot in which Structures were re-written.