Blueprints can be created for a class after removing the class from the project

If a class is added then removed from a project, blueprints can still be created based on the deleted class.

1. Open UE4Editor (any project)
2. Add class to project based on Actor (MyActor)
3. After class is added, create new blueprint based on MyActor
4. Close the editor
5. In the project folder path, go to /source/ProjectName/ and delete MyActor.cpp and MyActor.h
6. Right click on the .uproject and Generate Visual Studio Project files
7. Reopen the editor
8. Add new blueprint

Result:
MyActor still shows in the list of blueprintable classes

Expected:
MyActor does not exist after removing class from the project