"blogposts by this author" component is broken

The component does not render the expected output. To reproduce:

• add another blog document, add one of the authors to it
• open the blog overview page
• select the author with 2 documents
• select one of the blogs

Expected: the component displays the other blogpost from the same author
Actual: the component renders "No other posts found"

Tested using the Freemarker rendering, JSP version does not have this problem.