Invalid user hides author combobox

[dannyreaktiv]

Description

If the author for a post is invalid, the combobox to select a different author is not rendered.
Thus, unable to assign the post to a valid user.

    "code": "rest_user_invalid_id",
    "message": "Invalid user ID.",
    "data": {
        "status": 404
    }
}

Step-by-step reproduction instructions

1. Assign a post to a user who doesn't exist or does not have a role on the site. (Easiest would be to assign a fake user ID to a post's author in the database)
2. Load the post's edit page, and attempt to change the author to a valid user.

Screenshots, screen recording, code snippet

No response

Environment info

• WordPress 6.3.2, with a custom theme, on a Multisite.

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

[github-actions]

Hi,
This issue has gone 30 days without any activity. This means it is time for a check-in to make sure it is still relevant. If you are still experiencing this issue with the latest versions, you can help the project by responding to confirm the problem and by providing any updated reproduction steps.
Thanks for helping out.