Prediction: physics copy now has the correct layer assigned to fix predicted objects falling through the ground in games which use custom physics collision matrix

Assets/Mirror/Components/PredictedRigidbody/PredictedRigidbody.cs

@@ -208,6 +208,10 @@ protected virtual void CreateGhosts()
             physicsCopy.transform.rotation = transform.rotation;
             physicsCopy.transform.localScale = transform.localScale;
 
+            // assign the same Layer for the physics copy.
+            // games may use a custom physics collision matrix, layer matters.
+            physicsCopy.layer = gameObject.layer;
+
             // add the PredictedRigidbodyPhysical component
             PredictedRigidbodyPhysicsGhost physicsGhostRigidbody = physicsCopy.AddComponent<PredictedRigidbodyPhysicsGhost>();
             physicsGhostRigidbody.target = this;