Anyone got any idea what's going on here?
Tickets from Maidenhead to Newbury are historically similarly priced as those from Maidenhead to Aldermaston (route "Any Permitted") but there's no route "." alternative from Maidenhead to Newbury.
If it's some glitch, however, it also affects Maidenhead to Midgham and Maidenhead to Thatcham, also Twyford to Aldermaston, Marlow to Aldermaston and possibly other flows as well, as these all seem to have both route "Any permitted" and cheaper route "." alternatives.