A numbered locality name doesn't autocomplete well when followed by provinceCode (BC)

Currently in BC, only IRs are numbered locality names but, in principle, there could be others. Here is an example that doesn't autocomplete well:

|Input address|Best match|
|--|--|
Bear Bay 8|Bear Bay 8 near Bute Inlet, BC
Bear Bay 8 BC|8 BC Mine Rd, Grand Forks, BC

Start by reproducing the two address examples against the geocoder and compare the returned matches. Trace the autocomplete or address-matching entry point responsible for provinceCode handling; done means a numbered locality such as “Bear Bay 8 BC” no longer selects “8 BC Mine Rd” when the locality match is more appropriate.

Written by the indexing model from the issue text.