Post Process AnimBP is no longer initialized in Persona Viewport

Post Process AnimBPs used to be processed in the persona viewport.

This could have been intentional.

Occurs on?
4.14 - 3249277 - NO
4.15 - 3450819 - YES
4.16 - 3466753 - YES
4.17 - 3545186 - YES

1. Open the attached project in 4.15 or later
2. Open the Skeletal Mesh
3. Ensure there is a post process AnimBP assigned in the Asset Details
4. Select the skeleton
5. Open the AnimCurves window
6. Drag the "Attach" Anim Curve higher than 0.5

Result: Nothing happens
Expected: Cube appears attached to one of the bones (Try this repro in 4.14 to see expected)