When a user accepts an invite with an email address that matches a group
which automatically awards its members Trust Level 2, a race condition might happen
when the 'send_advanced_tutorial_message' job runs.
That job is enqueued inside the 'user_promoted' event which is triggered inside a
transaction on the user record. If the job runs before the transaction is done,
the user record is invisible and this generates an exception.
Régis Hanol
Joffrey JAFFEUX
Guo Xiang Tan