In map pins, it will allow you to create a pin and link it to an article or another map, but the map will reload instead of opening the link when it is clicked. Salamanderx27, who discovered the problem, posted a video of it happening in #Help on August 30. Possibly very early morning in UK, I'm not sure.
When creating a map pin (or in my case it was a polygon), link it to another map or article. Once the pin is created, and you click on the link in the description box, it will reload the current map instead of linking.
This is not a bug - the link there is a representation not an actual link - The presentation mode will allow you to move across maps. This will probably change in the upcoming update but not before