Row Fill for Grid panels do not appear to update dynamically for UMG

If the user tries to dynamically set the row fill for a grid panel nothing appears to change

1. Open the editor
2. Create a new widget blueprint
3. Add a grid panel to the designer tab
4. Add an image to the grid panel
5. Set the Grid panel to be a variable
6. Create the blueprint in the attached image

Dont work row fill in grid panel

Dont work row fill in grid panel