If you add some text to the pagebreak custom tag creating some paragraphs we get the following behaviors:
The blue box that surrounds the tag is broken on the first line, the other lines are in the blank space.
The new paragraph overlaps the first one

Steps to reproduce

1. Edit extension/ezoe/settings/content.ini.append.php
2. Activate the pagebreak tag
3. Create an Article
4. Add a pagebreak tag
5. After the pagebreak word press enter
6 Write "Second Line" in the editor