From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Mon, 14 Mar 2022 12:35:37 -0700
Subject: [PATCH] Don't allow vehicle movement from players while teleporting

Bring the vehicle move packet behavior in line with the
regular player move packet.

diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 7e46af4a325303df780a088ba8a0d8d4c719fa6b..1d2db5c0b1fbd98308659e878832cf7923b9eab0 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -491,6 +491,11 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
             this.disconnect((Component) Component.translatable("multiplayer.disconnect.invalid_vehicle_movement"), org.bukkit.event.player.PlayerKickEvent.Cause.INVALID_VEHICLE_MOVEMENT); // Paper - kick event cause
         } else if (!this.updateAwaitingTeleport() && this.player.hasClientLoaded()) {
             Entity entity = this.player.getRootVehicle();
+            // Paper start - Don't allow vehicle movement from players while teleporting
+            if (this.awaitingPositionFromClient != null || this.player.isImmobile() || entity.isRemoved()) {
+                return;
+            }
+            // Paper end - Don't allow vehicle movement from players while teleporting
 
             if (entity != this.player && entity.getControllingPassenger() == this.player && entity == this.lastVehicle) {
                 ServerLevel worldserver = this.player.serverLevel();