fix: Collider2D Not Registering Rigidbody2D Attached

Engine.Physics2D/Collider2DBehaviourBase.cs

@@ -23,5 +23,29 @@ public abstract class Collider2DBehaviourBase : BehaviourOverride, ICollider2D
 
     public abstract void Recalculate();
 
-    protected override void OnInitialize() => BehaviourController.TryGetBehaviour(out _rigidBody2D);
+    protected override void OnInitialize()
+    {
+        BehaviourController.TryGetBehaviour(out _rigidBody2D);
+
+        BehaviourController.OnBehaviourAdded += OnBehaviourAddedToController;
+        BehaviourController.OnBehaviourRemoved += OnBehaviourRemovedFromController;
+    }
+
+    private void OnBehaviourAddedToController(IBehaviourController _, IBehaviour behaviour)
+    {
+        if (behaviour is IRigidBody2D rigidbody)
+            _rigidBody2D = rigidbody;
+    }
+
+    private void OnBehaviourRemovedFromController(IBehaviourController _, IBehaviour behaviour)
+    {
+        if (behaviour is IRigidBody2D _)
+            _rigidBody2D = null;
+    }
+
+    protected override void OnFinalize()
+    {
+        BehaviourController.OnBehaviourAdded -= OnBehaviourAddedToController;
+        BehaviourController.OnBehaviourRemoved -= OnBehaviourRemovedFromController; ;
+    }
 }