Is Valid is true in PIE but prints false in package build

When using the IsValid node inside of a Widget blueprint with the Widget as the selected asset, the string will print as true in the Editor, but prints as false in the packaged build of the game.

Regression:
This issue does NOT occur in 4.14.3 binary build of the engine but does occur in 4.15.2 and 4.16 preview 3 of the Binary builds of the engine

1. Create a new project (no template or starter content needed)
2. Create a new widget blueprint > name it "TEST_BP" > Open TEST_BP
3. In TEST_BP's event graph On event begin play attach a print string node
4. add an IsValid node to the graph and for selected asset, select TEST_BP
5. In the level blueprint create Widget for TEST_BP and add it to the viewport
6. PIE (Expected result)
7. Save all and Name the level > Set the level to be the game default map in the project settings
8. Package the game and Run the Executable
   Result: The string prints as false
   Expected Result: The string prints as true

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