PCG - Can't subclass PCG metadata nodes - Subclasses of FSimplePCGElement not marked as extern with PCG_API macro

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I’m trying to extend from FPCGMetadataElementBase in C++ so I can implement more nodes in PCG graphs for changing point attributes.

The issue is FPCGMetadataElementBase and all other subclasses of FSimplePCGElement aren’t marked as extern with the PCG_API macro, so I can’t extend the classes in my game module without changing engine source code.

I’ve verified this is still the case in CL 31910460 in ue5-main branch.