Why are articles created in the front end not correctly set to featured?

From Joomla! Documentation

Articles set to "Featured" whether by editing an existing article or creating a new one are not correctly saved in the database.

This is fixed by the patch available here: | Issue 25240

To fix manually you have to change $this->getState('article.id') to $this->getState($this->getName().'.id')

Index: administrator/components/com_content/models/article.php
--- administrator/components/com_content/models/article.php	(revision 20925)
+++ administrator/components/com_content/models/article.php	(working copy)
@@ -220,7 +220,7 @@
 		if (parent::save($data)) {
 			if (isset($data['featured'])) {
-				$this->featured($this->getState('article.id'), $data['featured']);
+				$this->featured($this->getState($this->getName().'.id'), $data['featured']);
 			return true;