Recently I changed the name of some of my categories including slug. From photography (slug photography) to wedding photography (slug wedding-photography).
While the new URL with category wedding-photography works fine I noticed that the old URL with category photography is still working and displays the same content instead of leading to a 404 error page as there is no longer a category name photography including slug?
How is this possible? Can someone tell me how I can make that old URL leading to 404. Don't want same content in 2 posts.