I think I see the problem, the kwrite icon is currently packaged in the kate rpm.
Thanks for the heads-up.
From: Sudhir Khanger <ml(a)sudhirkhanger.com>
Sent: Thursday, January 28, 2016 7:35 AM
Subject: KWrite has started using unknown file-type icon.
Something broke Kwrite icon. It's now using default unknown icon. I have
deleted both ~/.config and ~/.kde icon cache files but that didn't help. See the
attached screenshot of the new broken kwrite icon.