Thanks @rod and @tqwhite for helping @Cyb3r with this Glad we have you on the community!

@pitaj I did some testing today with /categories 404'd. Seems as though things continued to work fine. I'm not disabling the functionality, just access to the page.

Actually it was an update pushed in the last couple of hours which have solved the issue. At least on one of the plugins which I have tested. I hope it will be the same way on all the plugins. Thanks for your help.