From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 25 Jun 2023 13:57:30 -0700
Subject: [PATCH] Sync vehicle position to player position on player data load

This allows the player to be re-positioned before logging into
the world without causing thread checks to trip on Folia.

diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index db2903276c694d395f62afdc7c71344466ae505f..5f9c89dbbfa9b3e4d2b68c0d8628cf223c1f7aa0 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -522,7 +522,13 @@ public abstract class PlayerList {
         if (optional.isPresent() && ((CompoundTag) optional.get()).contains("RootVehicle", 10)) {
             CompoundTag nbttagcompound = ((CompoundTag) optional.get()).getCompound("RootVehicle");
             ServerLevel finalWorldServer = worldserver1; // CraftBukkit - decompile error
+            Vec3 playerPos = player.position(); // Paper - force sync root vehicle to player position
             Entity entity = EntityType.loadEntityRecursive(nbttagcompound.getCompound("Entity"), worldserver1, (entity1) -> {
+                // Paper start - force sync root vehicle to player position
+                if (entity1.distanceToSqr(player) > (5.0 * 5.0)) {
+                    entity1.setPosRaw(playerPos.x, playerPos.y, playerPos.z, true);
+                }
+                // Paper end - force sync root vehicle to player position
                 return !finalWorldServer.addWithUUID(entity1, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.MOUNT) ? null : entity1; // CraftBukkit - decompile error // Paper - Entity#getEntitySpawnReason
             });