After the last update using the packages in the 2017Q1 branch, I noticed some broken images in my feed. Trying to load the images on their own showed that they were being cached on the tt-rss server and were giving me an error about an undefined function mime_content_type(). Google and the php documentation showed me that this function is part of the fileinfo extension. Installing that package resolved the issue.
Committed, thanks for the notification!
A commit references this bug:
Date: Sun Feb 19 17:18:23 UTC 2017
New revision: 434409
Adding a missing dependency on php56-fileinfo.
Submitted by: nimrodl (at) gmail.com