Physics2D Center Of Mass incorrect after changing object scale

I'm seeing what appears to be a center of mass bug after scaling an object with a PolygonCollider2D and a RigidyBody2D. See below image for the gameobject settings.


The Center Of Mass seems to adjust incorrectly as I Scale the object up. See attached gif.

I expect that the center of mass should stay at the same point as when the scale is 1,1,1 and it is scaled up uniformly.

I'm on Unity 2018.4.17 and the code i'm using to display the center of mass is below

Code (CSharp):

1.  
2. using UnityEditor;
3. using UnityEngine;
4. [CustomEditor(typeof(Rigidbody2D))]
5. public class RigidbodyEditor : Editor
6. {
7.     void OnSceneGUI()
8.     {
9.         var rb = target as Rigidbody2D;
10.         Handles.color = Color.red;
11.         Handles.SphereHandleCap(1,rb.transform.TransformPoint(rb.centerOfMass),Quaternion.identity,0.1f, EventType.Repaint);
12.     }
13.  
14.     public override void OnInspectorGUI()
15.     {
16.         GUI.skin = EditorGUIUtility.GetBuiltinSkin(UnityEditor.EditorSkin.Inspector);
17.         DrawDefaultInspector();
18.     }
19. }

 

Ah got yeah. I've gone ahead and attached a gif showing off the Rigidbody2D info.

It does indeed look like the Local Center Of Mass is changing.

 

Sorry I suppose why I was getting confused is I didn't see how my collider center was offset.

After some closer investigation though I can see that the pivot point for the sprite is what effects the bounds center. I had the pivot point at the bottom center and thus the collider bounds were being shifted to accommodate that I presume.

So now that this is finally starting to make some sense (really appreciate the help btw!) based on your experience can you give me some guidance on the best way to move forward. Essentially I want to scale up my rocket to 20% of what the normal size is but I want to ensure the center of mass adjusts as if the bounds center was 0,0,0.

Some solutions I was thinking through were as follows.
1. Manually adjust the center of mass after scale increase setting Rigidbody2D.centerOfMass.
2. Adjusting the pixels per unit of the missile sprite so that it increases the sprite size by 20% but I can still keep the scale at 1,1,1.

Thanks so much in advance and for all the help thus far.

---Edit---

I went ahead and adjusted the pixels per unit but realized pretty quickly that the downside there is I have to adjust all my child gameobjects in relation to this new sprite size. It looks like the manual adjustment of the center of mass might be the best way to go about this then.