Hey -
To make sure I followed the same steps I started by creating a new Character class called MyCharacter. I then made a blueprint based on MyCharacter. In code I added the lines that you posted above and then compiled. In the blueprint I noticed that the ShieldComponent was listed and my Details panel showed the following:
Clicking the arrow next to Shield Component then brought up the rest of the details panel options. Let me know if you’re seeing something similar or if you experience something else.
Cheers