Clickable widgets fail to function as UWidgetComponents in standalone

When in standalone, any widget that takes a click event doesn't respond properly to user input.

Tested in 4.19(CL - 403788), 4.20(CL - 4228271), and 4.21(CL - 4229747)

1. Create a First Person Blueprint project
2. Open the First Person Character Blueprint
3. Add a Widget Interaction Component under the FirstPersonCamera Component
4. Enable the Show Debug in the Widget Interaction Component
5. Add a Get reference to the Widget Interaction Component
6. Drag pin from get reference of component and select the Press Pointer Key and Release Pointer Key functions
7. Set the Key for both functions to Left Mouse Button
8. Within the Event Graph of the First Person Character Blueprint, disconnect the InputAction Fire execution located in the Spawn projectile comment box and drag execution pins to the Pointer Key functions
9. Create a widget blueprint with a combobox  and add three options to the combobox
10. Add the widget blueprint to the scene
11. Play as standalone
12. Attempt to click the combobox in the world space

Expected: The combobox should present the options provided.

Result: The combobox doesn't react to input.