I have changed my username and was told I have to resave my world's configuration to have the username change apply to the URLs (https://www.worldanvil.com/udan-tracker/e629ebdb-14ad-4560-a044-561a022cd4e7/view). However, whenever I try to save the world configuration I get an error: 404 “ Thus you have reached the end of this world.” Head to World Anvil Homepage
Go to "World settings", change anything (or don't even change anything), click button "Save Changes" -> error 404 )and nothing will be saved)
Today it worked, so this can be closed.
having the same issue over here, every time i try it redirects to the 404 page and it doesn't save. though for some reasons some things seem to have saved (the things in time & date), though i don't see them applied to the homepage. also, i have a different browser (google) but i tried a few others and the same thing happened every time