I've just come across a bug in editing posts in Marketplace - when editing a reply, both the original and edited replies appear, with the edit appearing as a reply to the original post.
Steps to reproduce:
1. Go to Marketplace and select a thread that was started before the upgrade took place.
2. Reply to the post and save.
3. Edit the post and add text.
4. Save the changes.
Expected result: edited post appears at the bottom of the post with the 'edit