Fixes optimization and UI/UX updates

Assets/Darkmatter/Code/Libs/Observer/Systems/EventBus.cs

@@ -15,7 +15,23 @@ namespace Darkmatter.Libs.Observer
             if (_map.TryGetValue(typeof(T), out var handlerObj))
             {
                 var action = (Action<T>)handlerObj;
-                action?.Invoke(evt);
+                if (action == null) return;
+
+                // Invoke handlers one by one: a multicast invoke would let one throwing
+                // subscriber silently starve every later subscriber and rethrow into the
+                // publisher (paint / scene-transition code), turning a local bug into a
+                // stuck flow.
+                foreach (var handler in action.GetInvocationList())
+                {
+                    try
+                    {
+                        ((Action<T>)handler).Invoke(evt);
+                    }
+                    catch (Exception e)
+                    {
+                        UnityEngine.Debug.LogException(e);
+                    }
+                }
             }
         }