Paper/patches/server/0107-Auto-fix-bad-Y-levels-on-player-login.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 21 Sep 2016 23:48:39 -0400
Subject: [PATCH] Auto fix bad Y levels on player login

Bring down to a saner Y level if super high, as this can cause the server to crash

diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index a21496bc07c4691b99f9f58a0493e6e054c02641..d5bdf1e58bf48b5738e98159afb54630220af5b0 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -397,6 +397,7 @@ public class ServerPlayer extends Player {
     @Override
     public void readAdditionalSaveData(CompoundTag nbt) {
         super.readAdditionalSaveData(nbt);
+        if (this.getY() > 300) this.setPosRaw(getX(), 257, getZ()); // Paper - bring down to a saner Y level if out of world
         if (nbt.contains("enteredNetherPosition", 10)) {
             CompoundTag nbttagcompound1 = nbt.getCompound("enteredNetherPosition");