Error during packaging if nativizing a blueprint that contains a TMap with TSubclassOf as a key

Packaging with with a nativized blueprint that contains a TMap with a TSubclassOf pointer as a Key causes errors, causing the packaging attempt to fail.

Regression?: No
Compiling the code for the TMap using a TSubclassOf pointer as a Key failed in 4.18, blocking this from being tested.

1. Download the attached project, generate project files, compile, and open the project
2. Package for Windows 64-bit
   Result: During the packaging process, an error occurs due to the TSet being nativized
   Expected: The packaging process completes successfully

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