Combo box does not function in packaged build

The ComboBox (string) element for UMG is not correctly displaying, The array options do not appear and can not be selected, for the packaged build, while PIE behaves as expected.

Regression:
This is a regression from 4.15.2 build

1. Create a new project (No Template or starter content needed)
2. Create a new widget blueprint > Name it "TestWidget_BP" > Open TestWidget_BP
3. Add a ComboBox (String) to the Canvas Panel
4. In the ComboBox Details panel Under the content category Add 2 array elements and label them 0 & 1 respectively (screenshot_01)
5. Compile & save the widget Blueprint
6. Open the level blueprint and Recreate the blueprint in Screenshot_02
7. Save all and name the level "TEST"
8. PIE (expected result)
9. in the Project settings set TEST to the Game default map
10. Package the project for Windows (Devlopment Build)
11. Play the Packaged build (Result)

Result: The ComboBox does not display the array options and cannot be selected
Expected Result: The ComboBox does display the array options and can be selected

Fix UE-51650

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