Translations:NPC Placement and Alignment/64/en
From DragonMineZ Wiki
The Otherworld NPCs (master_kaiosama, master_enma, master_baba, master_toribot, master_grandkai, master_otherworld_announcer and npc_hell_ogre) always force override: true internally, whatever the file says, since they need to exist reliably in a generated dimension. See Otherworld.