Fix subclass typedefs #437

Job	Run time
build (windows-latest, net472, 20.x, Release)	6m 16s
build (windows-latest, net6.0, 20.x, Release)	6m 25s
build (windows-latest, net8.0, 18.x, Release)	7m 21s
build (windows-latest, net8.0, 20.x, Release)	7m 30s
build (macos-latest, net6.0, 20.x, Release)	2m 52s
build (macos-latest, net8.0, 18.x, Release)	4m 8s
build (macos-latest, net8.0, 20.x, Release)	3m 42s
build (ubuntu-latest, net6.0, 20.x, Release)	3m 43s
build (ubuntu-latest, net8.0, 18.x, Release)	5m 7s
build (ubuntu-latest, net8.0, 20.x, Release)	4m 59s
	52m 3s

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