Hey -
I’m trying to reproduce your issue but don’t believe I’m getting the same result. I created a new project and used the “Add Code to Project” wizard to add a class based on actor. I immedately built the project and ran in debug mode to reopen the editor. After creating a blueprint based on the new class it shows MyProject.MyActor as the parent in the content browser and MyActor.h if I open the blueprint. I then go back into VS and add a float variable and recompile/reload in debug mode. Both the content browser and BP still show MyProject.MyActor and MyActor.h respectively. Please let me know if there is something that I am doing differently from your setup.
Cheers