Board Thread:Support Requests - Getting Technical/@comment-93604-20181123131405/@comment-27958705-20181123211623

sometimes, extension js is not loaded. use special:contact/bug to report the bug.

as quick fix u can use this code: mw.hook('wikipage.content').add(function($c){if($c.find('.CategoryTreeTag').length)mw.loader.load(['ext.categoryTree','ext.categoryTree.css'])});