Description

If theme.json uses a ref value for a property, the Site Editor doesn't understand this property and throws an error:

Step-by-step reproduction instructions

1. Use a theme that uses refs for a theme.json property (e.g. Rainfall)
2. Try to edit that property (for Rainfall it's links)

Probably connected, we see this in the inspector:

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes