When you invite someone to a topic, the <input> allows browser autocompletion, but Discourse implements its own autocompletion. This means that when I type “fred”, the browser might suggest "fred@fred.com", whilst Discourse suggests “winifred”. Discourse is, of course, the one that I want to use, as it completes by username. 
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Sure @techapj can you add the HTML attribute that suppresses browser autocomplete here?
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Fixed via:
https://github.com/discourse/discourse/commit/b4e32f20f228967d3809e5d3a7277cbe58c14839
Thanks for bringing this in our notice @barryvan 
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