I had that issue too until I changed the store address.
Does this make sense? What’s weird is that when I am logged in as a role that is not supposed to use the fields, the new fields are not hidden in any way ( display: none;). If they were hidden from visibility, it would make sense that the error would come up, but this is not the case. The fields are no where in the html.
I am also looking for a way to change the abbreviation.