Comment 1 for bug 1513716

This appears to be an intermittent or at least platform-specific problem. But if you were going to try to replicate it, these would be the steps:

1. Create a blog post.
2. Save the blog post.
3. Open the blog post back up for editing.
4. Make a change to the blog post.
5. Save the blog post again.

If you use xdebug or another debugging tool, you can see that on that second save attempt, at least one ArtefactTypeBlogPost object will get its destructor called while $this->dirty is true, causing a database commit to happen during the destructor call.