It is now possible for apps to view the access field of metafield definitions they have access to but do not own. An AuthorizationError error was previously returned when accessing the field for definitions the app didn't have permissions to manage. Note that accessing the access.grants field still requires permissions to manage the definition and an error will be returned if accessing the field with insufficient permissions.
This is a companion discussion topic for the original entry at https://shopify.dev/changelog/updates-to-metafield-access-controls