I got a warning in mkgmap.log:

2017/09/10 08:20:56 AVERTISSEMENT (StyledConverter): 20000001.osm.pbf:
Oneway road 170172273 with tags [highway=residential,
mkgmap:admin_level2=FRA, mkgmap:admin_level3=Mayotte,
mkgmap:admin_level4=Mayotte, mkgmap:admin_level6=Mayotte,
mkgmap:admin_level8=Pamandzi, mkgmap:city=Pamandzi, mkgmap:country=FRA,
mkgmap:label:1=Rue des Écoles, mkgmap:postal_code=97610,
mkgmap:postcode=97610, mkgmap:region=Mayotte, mkgmap:residential=yes,
mkgmap:street=Rue des Écoles, mkgmap:unpaved=0, name=Rue des Écoles,
oneway=yes, surface=asphalt] comes from nowhere at
http://www.openstreetmap.org/?mlat=-12.796864&mlon=45.283151&zoom=17

Access seems to me possible, from "Rue des Écoles", on the right (east)
of the map.

Is routing affected ?

Regards.

Steph