You'll notice
Useful3 Signal2
Logging in or out mid-refresh no longer gets overwritten by stale background settings.
What's wrong with this entry?
Anonymous. No account, no email.
What
If you log in or out while a background remote-settings refresh is still running, that stale refresh no longer applies its result.
Evidence
Remote settings: Background poll superseded by a login/logout reset; not notifying
Strings lifted out of the shipped bundle, so the claim above can be checked against them.