Cannot display Folder News and Folder Events on frontend.

Prereq.: Ibexa Commerce 3.2/3.3 on Postgres with LSE. Fix from EC-331 is needed to uncover this.

Steps:

1. Publish a Folder News and Folder Events content item.
2. Try to display them on frontend.

Actual result: Error 500 occurs

An exception has been thrown during the rendering of a template ("Database error").

Remarks: Does not occur on PG with Solr. Does not occur on MySQL with LSE/Solr.
Stack trace attached.