Nintendo has rolled out version 1.5.0 of Animal Crossing: New Horizons and while the main purpose of this update was to add some spooky seasonal content in time for Halloween, it seems to have also removed certain hacked items.
One item that’s gone missing since this update is Harv’s hacked fence – based on the same fence on his island, Photopia. For this item, hackers have been distributing stacks of this fence to other players – allowing them to place them around their own islands. As of the latest update, it appears these days are over.
— ☾ (@CZRABINO) September 30, 2020
There are many players on social media mourning the loss of their hacked fences, and it appears that the only way to keep hold of these fences is not updating the game.