This occurs on all world types, I had it on superflat and normal creative. There is an error in the console:
Error executing task on Server java.lang.NullPointerException at yd.b(SourceFile:201) at xw.a(SourceFile:904) at yi.a(SourceFile:478) at zc.a(SourceFile:845) at ri.a(SourceFile:122) at ri$b.a(SourceFile:18) at na.a(SourceFile:21) at ug.run(SourceFile:18) at akx.c(SourceFile:144) at alb.c(SourceFile:23) at net.minecraft.server.MinecraftServer.b(SourceFile:749) at net.minecraft.server.MinecraftServer.c(SourceFile:142) at akx.w(SourceFile:118) at net.minecraft.server.MinecraftServer.bc(SourceFile:731) at net.minecraft.server.MinecraftServer.w(SourceFile:725) at akx.bm(SourceFile:103) at net.minecraft.server.MinecraftServer.v(SourceFile:709) at net.minecraft.server.MinecraftServer.run(SourceFile:662) at java.lang.Thread.run(Thread.java:745)
Jasper Mare
This occurs on all world types, I had it on superflat and normal creative.
There is an error in the console:
Error executing task on Server java.lang.NullPointerException at yd.b(SourceFile:201) at xw.a(SourceFile:904) at yi.a(SourceFile:478) at zc.a(SourceFile:845) at ri.a(SourceFile:122) at ri$b.a(SourceFile:18) at na.a(SourceFile:21) at ug.run(SourceFile:18) at akx.c(SourceFile:144) at alb.c(SourceFile:23) at net.minecraft.server.MinecraftServer.b(SourceFile:749) at net.minecraft.server.MinecraftServer.c(SourceFile:142) at akx.w(SourceFile:118) at net.minecraft.server.MinecraftServer.bc(SourceFile:731) at net.minecraft.server.MinecraftServer.w(SourceFile:725) at akx.bm(SourceFile:103) at net.minecraft.server.MinecraftServer.v(SourceFile:709) at net.minecraft.server.MinecraftServer.run(SourceFile:662) at java.lang.Thread.run(Thread.java:745)