SPIGOT-7048: addPassenger() not working when vehicle is player

By: md_5 <git@md-5.net>

paper-server/nms-patches/net/minecraft/server/level/EntityTrackerEntry.patch

@@ -27,6 +27,15 @@
          this.ap = Vec3D.ZERO;
          this.lastPassengers = Collections.emptyList();
          this.level = worldserver;
+@@ -80,7 +90,7 @@
+ 
+         if (!list.equals(this.lastPassengers)) {
+             this.lastPassengers = list;
+-            this.broadcast.accept(new PacketPlayOutMount(this.entity));
++            this.broadcastAndSend(new PacketPlayOutMount(this.entity)); // CraftBukkit
+         }
+ 
+         Entity entity = this.entity;
 @@ -88,18 +98,18 @@
          if (entity instanceof EntityItemFrame) {
              EntityItemFrame entityitemframe = (EntityItemFrame) entity;