fix host peer not cleared when a multiplayer session ends

docs/release-notes.md

@@ -1,6 +1,8 @@
 # Release notes
 ## 2.9.3
-* Fixed errors hovering items in some cases with SMAPI 2.9.2.
+* For players:
+  * Fixed errors hovering items in some cases with SMAPI 2.9.2.
+  * Fixed some multiplayer features broken when a farmhand returns to title and rejoins.
 
 ## 2.9.2
 * For players:

src/SMAPI/Framework/SGame.cs

@@ -217,7 +217,7 @@ namespace StardewModdingAPI.Framework
         private void OnReturnedToTitle()
         {
             this.Monitor.Log("Context: returned to title", LogLevel.Trace);
-            this.Multiplayer.Peers.Clear();
+            this.Multiplayer.CleanupOnMultiplayerExit();
             this.Events.ReturnedToTitle.RaiseEmpty();
 #if !SMAPI_3_0_STRICT
             this.Events.Legacy_AfterReturnToTitle.Raise();

src/SMAPI/Framework/SMultiplayer.cs

@@ -82,6 +82,13 @@ namespace StardewModdingAPI.Framework
             this.OnModMessageReceived = onModMessageReceived;
         }
 
+        /// <summary>Perform cleanup needed when a multiplayer session ends.</summary>
+        public void CleanupOnMultiplayerExit()
+        {
+            this.Peers.Clear();
+            this.HostPeer = null;
+        }
+
 #if !SMAPI_3_0_STRICT
         /// <summary>Handle sync messages from other players and perform other initial sync logic.</summary>
         public override void UpdateEarly()