P: Face names saved to .heic metadata don't import

When you import a .heic containing a face name saved to the photo's metadata, LR doesn't import the face name. But this works correctly with .jpgs. To reproduce:

1. Make a new catalog.

2. Import a .heic photo containing a face, export it as a .jpg, and import the .jpg into the catalog.

2. In Loupe, label the face in both photos with "John".

3. Select both photos and do Metadata > Save Metadata To File.

4. Remove both photos from the catalog.

5. Reimport both photos into the catalog.

6. In Loupe, observe that the .jpg's face is still labeled with "John" but the .heic's face has "?".  Observe that both photos have keyword "John".

See the attached screen recording.

Tested with LR 11.0.1 / Mac OS 11.6.