Something messed up with ufgroup.name in 5.71 (aka can't create new contacts on the fly in entityref widgets)
- For one, there's now two definitions of the name column in the schema xml.
- For two, I think what's happening is when you upgrade it borks the name of reserved groups if they didn't have a frontend_title (which seems likely if your install is from around 5.63(?) or earlier), and at least one consequence of this is entityref widgets no longer allow creating new contacts on the fly.