Nevermind I think it was just one of my mods. Ignore this
I'm trying out hallowed nights and yesterday it was working fine. Today the candy backpacks that are found on the floor do not let me place any items in it. The character says that it belongs to someone else or that another character is using it. This is a solo world so no one else could be using the bags.Also the bags are not opening or closing. I've got it so it is supposed to appear underneath the regular inventory but it doesn't at all.