Plugin breaks taxonomies on multisite

Through a lot of trial and error we’ve found this plugin to be the culprit on a NGNIX server with a multi site wordpress install.

The problem was that on the front-end nothing that was a term (single taxonomy) was visible on the site, there was no php error, nothing in the console, really nothing that indicated that something was wrong, just terms where not showing.

In the backend everything was fine.