The content of macros that are editable inline is saved as HTML

Steps to reproduce:

1. Complete Fresh xwiki standard flavor installation
2. Edit Sandbox, don't change anything
3. Save and View

The sandbox page now show:

<p>Don't worry about overwriting or losing stuff when editing the page, you can always roll back to the first version of the page from the "History" tab at the bottom of the page.</p>
See attached GIF

This does not happen until the page is saved, the source view is fine, see second GIF

Using the xwiki syntax editor is fine, but if you switch from CKEditor to xwiki editor, the <p> is already there, see GIF "switch-to-xwiki-editor"