Reported by customer

How to reproduce:
*Create blank new page.
*The first line has Heading 2.
*The second line is normal paragraph text.
*Save page.
*Edit page.
*Put cursor at beginning of first line and press enter.

What SHOULD happen (if following WYSIWYG convention and norms is important to Atlassian): Heading 2 should be retained on first line.
What ACTUALLY happens: Heading 2 style dropped from that line and put on the blank new line instead.