While we are on the topic, I can share a couple other related issues I have noticed with the editor.
At times I will make a post, it will appear perfectly, then I will edit the post and save, and I will notice that the line spaces changed elsewhere in the post, in an area I did not touch. This has happened on multiple occasions. If you do go digging in that dark evil place, you may notice something related to this issue.
Also, in the regular editor, when images are inserted they appear where ever the cursor has been placed. When we switch to the Rich Text editor, images are always inserted at the bottom.