(Windows 10, 64 bit, UE4.15) Steps to reproduce
- Create empty blueprint project
- Create Blueprint Interface
- Create Structure
- Set a variable in structure to be the interface
- Create a function in interface where a input variable is the structure
- Navigate to Edit->ProjectSettings->Project->Packaging
- Set Blueprint Nativization Method to Inclusive
- In main viewport, navigate to File->Package Project->Windows->64-bit
Attached is a sample project with the bug Attachment