Changing WidgetComponent's Background Color doesn't update the widget's background color

It appears that changing the Background Color of a widget component doesn't immediately update the widget's render target. Toggling "Draw at Desired Size", however, does get the changes to reflect in the widget's render target.

Attached a project with minimal repro case.

1. Create a new Widget Blueprint
2. Delete the Canvas Panel root element
3. Add a Text Block, and set the text to Hello, World
4. Set the size to "Desired"
5. Create a new Actor Blueprint
6. Add a Widget Component to that blueprint
7. Set the Widget Component's Class to your new Widget Blueprint
8. Set the Widget Component's Blend Mode to Opaque
9. Set the Widget to "Draw at Desired Size"
10. Change the Widget Component's Background Color to (1, 0, 0, 1)
11. Observe the widget component's background color not change to a fully opaque red

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