Set Position Shape Gizmo isn't refreshed after shaper switch

Steps to reproduce:

1. Create a new VFX using the Simple Loop template
2. Drag and drop the VFX in a scene.
3. make sure that your VFX editor is attached to the VFX.
4. In the Initialize Context, select the Set Position Shape “Sphere” block.
5. Increase the Radius setting until you can clearly see the Sphere shape's gizmo in the Scene.
6. Change the Shape from Sphere-> Box?

Actual results: 

Notice that after switching the shape, the Shape's Gizmo is still displaying the previous shape.

Expected results: 

The Shape's Gizmo should be properly updated and instantly reflect the newly selected shape.

As a workaround, the user can now unselect and re-select the Set position shape block to see the gizmo being refreshed/updated.

Reproducible with versions: 6000.2.0a10

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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