Staged invited user did not become registered user

[tshenry (Taylor)]

Yes sir, that’s the full repro!

[codinghorror (Jeff Atwood)]

That was a tough one, thanks for sticking with us!

[debryc (Deborah Chang)]

Teamwork! Thanks all for tracking down the bug. I really appreciate it.

[dan (Dan Ungureanu)]

The changes that fix this problem are currently under review and will be merged soon:

https://github.com/discourse/discourse/pull/8221