Bug: Lost Admin privileges after successfully claiming site

How to reproduce this error:

1: In your user account page, create more than one email address and verify them both, marking one as your primary.
2: Get approved as the Admin for your primary address.
3: Change primary address to non-approved, but verified, email address.

In step one, you are not an admin. In step two you are an admin. In step three you are no longer and admin, even if you switch back to the previous email.
 
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