Scenario as follows:
An email address is added to my account due to me clicking on an invitation "accept" link in an email (btw, this is annoying, a "accept invite but do not add address"-option would be nice)
I go to the email address management page
The new address (say, firstname.lastname@example.org) is displayed first, the old address (say, email@example.com) second.
I click the delete button next to the new address (firstname.lastname@example.org)
The second address disappears from the list, so the list now only contains email@example.com
After reloading the page, the list contains only firstname.lastname@example.org as one would expect.
The bug also occurs when manually adding email addresses. The bug only occurs when deleting the first of two email addresses in the list. I did not try with more than two addresses.