Always get the latest ServerPlayerEntity from ServerPlayNetworkHandler (

#3735)

(cherry picked from commit 0dca034)

fabric-networking-api-v1/src/main/java/net/fabricmc/fabric/impl/networking/server/ServerPlayNetworkAddon.java

@@ -48,7 +48,7 @@ public ServerPlayNetworkAddon(ServerPlayNetworkHandler handler, ClientConnection
 		super(ServerNetworkingImpl.PLAY, connection, "ServerPlayNetworkAddon for " + handler.player.getDisplayName());
 		this.handler = handler;
 		this.server = server;
-		this.context = new ContextImpl(handler.player, this);
+		this.context = new ContextImpl(handler, this);
 
 		// Must register pending channels via lateinit
 		this.registerPendingChannels((ChannelInfoHolder) this.connection, NetworkPhase.PLAY);
@@ -129,10 +129,15 @@ protected boolean isReservedChannel(Identifier channelName) {
 		return NetworkingImpl.isReservedCommonChannel(channelName);
 	}
 
-	private record ContextImpl(ServerPlayerEntity player, PacketSender responseSender) implements ServerPlayNetworking.Context {
+	private record ContextImpl(ServerPlayNetworkHandler handler, PacketSender responseSender) implements ServerPlayNetworking.Context {
 		private ContextImpl {
-			Objects.requireNonNull(player, "player");
+			Objects.requireNonNull(handler, "handler");
 			Objects.requireNonNull(responseSender, "responseSender");
 		}
+
+		@Override
+		public ServerPlayerEntity player() {
+			return handler.getPlayer();
+		}
 	}
 }