There is a change at the bottom. Anita's edit removed a trailing blank line. It would be really nice if the diff displayed characters for white space (or had a mode where we could toggle it on and off).
Removing the extraneous backslashes from the tag should restore the formatting in the WYSIWYG editor.
It looks like the editor doesn't understand tags (there's a feature request to fix that) You have to switch to Markdown mode before entering them. If you type
[tag:bug] in WYSIWYG mode it will escape the brackets presumably so that they don't get interpreted as Markdown, but then the tag gets rendered properly anyhow? I'm not sure what is going on there.
I enabled the new editor to test adding a tag, and inserting a tag in a post is really not intuitive.
diff typed in WYSIWYG mode (preview doesn't render the tag, but it renders in the post when I save the edit)
diff typed in Markdown mode (preview does render the tag)