Nativizing Blueprint fails when struct is not initialized properly

The PreferredNavData member of NavAgentProperties isn't properly initialized. It is using some constructor that doesn't seem to be valid. This is a regression from 4.19.2 (CL-4033788) as this same setup packages with no errors. This can be worked around by connecting a "Make Soft Class Path" to the "Preferred Nav Data" pin thereby initializing the property manually

This issue was reported and tested in 4.20.2 (CL-4302132). It was reproduced in Main 4.21 (CL-4313833)

1. Open the UE4 Editor and create a new Blank Template project
2. Create an Actor Blueprint
3. In the Actor Blueprint add the "Make NavAgentProperties" node and promote a variable off of the output
4. Connect the new variable to BeginPlay then Compile and Save
5. Open the Project Settings > Packaging
6. Set "Blueprint Nativization Method" to Inclusive
7. Package the project for Win 64

Results: Packaging fails with error C2039: 'StaticStruct': is not a member of 'FSoftClassPath'

Expected: Packaging is successful