Add Component node loses reference on BP compile

When adding an actor or scene component blueprint reference to an actor blueprint, the component gets changed to an Add Component node when updating the component blueprint. This bug was not present in version 4.17.3 and is a regression.

1. Open a blank project
2. Create a Blueprint Actor and a Blueprint Scene Component
3. In the Actor BP add your Scene Component BP to the Event Beginplay and compile
4. In the Scene Component BP add any node to it and compile

Result: The Scene Component BP reference in the Actor BP is now an Add Component node

Expected: The Scene Component BP reference stays the same in the Actor BP