UE5 bug with drag and drop Metahuman BP to inside Actor BP?

Hey! I noticed when I tested the functionality of the Metahuman SDK. Inside UE5, I tried to move the Metahuman BP file with the mouse into Actor BP. It doesn’t work - it works when I move it to Open level Blueprint. The transfer is successful if you use the Copy/Paste function from the Open level Blueprint editor to the Actor BP side. Is it just a bug or is there a more specific reason?