[BUG]C++ changes does not apply to blueprint

After I changed C++ source code, I built it.
But C++ source code changes does not apply to blueprint.
Is there a good way to refresh blueprint or apply source code changes to blueprint?

I"m seeing a similar issue in 4.5.1. Any changes to the default values of my UPROPERTY variables in C++ aren’t reflected in the Blueprint subclass unless I create a completely new subclass again.

The only solution is to remove your blueprint entirely (delete it) and create a new blueprint based off of the changed C++ class. We have been struggling with bugs like these for a very long time. We are now trying to move everything entirely to C++ because of this.