The interaction of the initial comment in the bug nomination test (added in db-devel), and the affected user and the test (added in trunk) for affected users is the cause. Marking a bug as affected forces flushing, which triggered the code that populates message_count.
The interaction of the initial comment in the bug nomination test (added in db-devel), and the affected user and the test (added in trunk) for affected users is the cause. Marking a bug as affected forces flushing, which triggered the code that populates message_count.