Not sure if it’s possible or if I’m missing a setting or something, but with the new post types/taxonomies feature in 6.1 I don’t see where I can set “meta_box_cb” to false for a custom taxonomy. The “Admin Editor Support” option removes the metabox but it also removes the menu item, which I still want to have.
6.1 is still in Beta if I’m not mistaken. If you are testing and it’s not doing something you think it should do then I’d suggest contacting the developers.