Redmine

.reload not just gives us current record from database, but also resets *_changed? .changes and etc. in all later methods from callback chain for the reloaded item as a side-effect.
Since there are many plugins which rely on callbacks and sometimes dirty-tracking, this is a problem.
For now, there is a workaround - we can save .changed data in before_save callback. But i think it is better to just isolate the issue record in mailer.