Probably a bug in Xcode 12; will file a Radar.
Eventually I got it to build and run by copying the headers for each framework to the ..../DerivedData/MyApp-gyqvfqslpvdvpubdhccubciywesh/Build/Products/Debug-iphoneos/include folder manually.
If anyone has a solid workaround I'd love to hear it!
2ndNature
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