The signage and markings are the same as the signage for a displaced threshold as defined by the FAA:
https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap2_section_3.html
Obviously Beirut-Rafic isn't within FAA jurisdiction but the signage and markings are consistent with the FAA so I assume it is an international standard. If it was intended to only be a taxiway they would have kept the markings for a taxiway and used a demarcation bar at the runway threshold.
However, if it is a fault with the map, then this topic should be moved to the map's forum?