1) Create a new article
2) Enter body content
3) Add pagebreak custom tag by clicking the button
4) Try to enter new paragraph by hitting "Enter"
5) The cursor moves down but in the tag path, you can see it's still within the pagebreak tag
NB: The pagebreak button is not enabled by default, see AvailableCustomTags=pagebreak in extension/ezoe/settings/content.ini.append.php