I use "virtual pages" in Wordpress (you can google it) and i want to use some page slug that have been used before for a real page, for example: "domain.com/test".
If i use "domain.com/test1" for example it will work great but if i use "domain.com/test" it will give me 404. i am not sure why but i know it happens only with slugs that was used for real pages before, although they are deleted permanently.
How can i make Wordpress "forget" there was such a page and let me use the slug?