“email has been changed” toast shows even if request has failed

[fm3]

If you edit a user’s email address in the Users admin view, a failed request leads to both an error toast and a success toast. The success message should not be shown, and the value should not be updated in the list.

[fm3]

Same for user deactivation. The front-end changes, looking as though the user is now deactivated, independently of whether the request has gone through.

Example: “You cannot deactivate youfself” error shows correctly, but user is shown as deactivated until page refresh.