Paper/patches/server/0793-Update-head-rotation-in-missing-places.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Mon, 21 Jun 2021 21:55:23 -0400
Subject: [PATCH] Update head rotation in missing places

In certain areas the player's head rotation could be desynced when teleported/moved.
This is because bukkit uses a separate head rotation field for yaw.
This issue only applies to players.

diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index a0ba2eb443c8ba63a813b97b69a80d77e7320867..2155c63e81ab241043deba30fef6f4c8482b9047 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -1660,6 +1660,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
         this.setXRot(Mth.clamp(pitch, -90.0F, 90.0F) % 360.0F);
         this.yRotO = this.getYRot();
         this.xRotO = this.getXRot();
+        this.setYHeadRot(yaw); // Paper - Update head rotation
     }
 
     public void absMoveTo(double x, double y, double z) {
@@ -1698,6 +1699,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
         this.setXRot(pitch);
         this.setOldPosAndRot();
         this.reapplyPosition();
+        this.setYHeadRot(yaw); // Paper - Update head rotation
     }
 
     public final void setOldPosAndRot() {