Steps to reproduce:

• Create any custom style type block. No issue if the custom style has an inline type
• On the admin, edit or create a content 
• type something in the rich text field of your content and click on the right button to justify it
• then apply your block custom style on the content and publish
• you can observe the error: Validation of XML content failed: Error in 0:0: Element section has extra content: eztemplate**

Expected behavior:

The error should not occur