I have the same problem but I am not using any TSubclassOf’s in my constructors. Can you help explain how you narrowed down your problem?
I see what you mean as I was looking through the BlueprintCompilationManager.cpp and I also see that I get the error somewhere between:
UATHelper: Packaging (Windows): LogCook: Display: Cooked packages 471 Packages Remain 693 Total 1164
and
UATHelper: Packaging (Windows): LogCook: Display: Cooked packages 504 Packages Remain 686 Total 1190
But I don’t know where to go from there?