In the 17 instances built as one WMO (Wailing Caverns, Blackrock Depths, Molten Core, Dire Maul, the Deeprun Tram and others) benilla had no area: entering by portal kept the outside zone, no `ZONE_CHANGED_NEW_AREA` fired, and logging in inside left the zone texts empty.
On a map whose WDT carries MPHD bit 0 (`0x694904`), 1.12.1's area query `0x6703a0` answers the map's `Map.dbc` field 19 for every entity, ahead of any WMO or terrain read; a 0 there fails the query.
`MapCatalog` now reads field 19, the WDT exposes the bit, and `update_current_area` takes that leg first on such a map. A worldport also drops the old map's held area, which otherwise survived the transfer. Tests cover the leg, the flag's map, a zero field and the worldport; a live portal into Wailing Caverns fired `ZONE_CHANGED_NEW_AREA` with "Wailing Caverns".
Fixes#1636🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Sam Sung
cda3a91f7b