If I change the permalink structure to the following in the Permalinks settings page in WordPress:
Then I create a post with the slug my-post and add two categories for that post category1 and category2, will Google see this as duplicate content because if you go to both these links:
They will go to the same post but the URL does not change, isn’t this classed as duplicate content? Will Google and other search engines penalise a site that uses this practice? What is the recommend approach to this problem?