Thread:Extension talk:RSS/flickr tag not parsed inside MediaWiki:Rss-item

I have been using RSS to pull recent photos from a Flickr group with the Flickr extension. I have just upgraded MW from 1.18.2 to 1.21.1 and RSS from 1.9 to 2.22 and it stopped parsing the  tag (which works fine elsewhere). Instead of showing a photo is shows this:. I tried with no luck version 2.15 and also  just in case. The template I use that should be showing photos is here. You can also see MediaWiki:Rss-feed and MediaWiki:Rss-item.