Server clears EntityEventManager before starting a new round, not just when ending it (fixes events breaking during the next round if an item created an event when unloading the previous sub) + some additional error checks

Subsurface/Source/Networking/GameServer.cs

@@ -909,11 +909,12 @@ namespace Barotrauma.Networking
         private IEnumerable<object> StartGame(Submarine selectedSub, Submarine selectedShuttle, GameModePreset selectedMode)
         {
             Item.Spawner.Clear();
+            entityEventManager.Clear();
 
             GameMain.NetLobbyScreen.StartButton.Enabled = false;
 
             GUIMessageBox.CloseAll();
-
+            
             roundStartSeed = DateTime.Now.Millisecond;
             Rand.SetSyncedSeed(roundStartSeed);
 
@@ -1150,6 +1151,7 @@ namespace Barotrauma.Networking
             } while (secondsLeft > 0.0f);
 
             Submarine.Unload();
+            entityEventManager.Clear();
 
             GameMain.NetLobbyScreen.Select();
 

Subsurface/Source/Networking/NetEntityEvent/NetEntityEventManager.cs

@@ -36,6 +36,14 @@ namespace Barotrauma.Networking
                     tempBuffer.LengthBytes < 256, 
                     "Maximum EntityEvent size exceeded when serializing \""+e.Entity+"\"!");
 
+#if DEBUG
+                if (Entity.FindEntityByID(e.Entity.ID) != e.Entity)
+                {
+                    DebugConsole.ThrowError("Error in NetEntityEventManager.Write (FindEntityByID(e.Entity.ID) != e.Entity)");
+                }
+#endif
+                
+
                 msg.Write((UInt16)e.Entity.ID);
                 msg.Write((byte)tempBuffer.LengthBytes);
                 msg.Write(tempBuffer);