FRenderTarget::ReadPixels does not populate FColor array properly in packaged build

When the ReadPixels function is called, the FColor array that is passed in has its elements populated when in PIE and Standalone but array elements are empty in a packaged project.

1. Download and open attached project (rebuild .dlls when prompted)
2. Play in editor
3. Package project
4. Play packaged executable

Result:
In step 2, all array elements are shown as (R=255, G=255, B=255, A=0) - in step 4, all array elements are shown as (R=0, G=0, B=0, A=0)

Expected:
Array is populated in packaged project