I've also come to realize that Webkit exposes the address element as a contentinfo landmark instead.
Tested with Safari 12 + Chrome 72 (mac and PC), the accessibility inspectors in both browser's dev tools expose the address element as contentinfo. Thus VoiceOver treats the address element as a landmark.
With Chrome on Windows, address is also exposed as having a contentinfo role, but JAWS and NVDA ignore this, instead only surfacing <footer> as a contentinfo landmark.
Address should not be exposed as a contentinfo landmark in Webkit.