Palace of the Dead Luring Trap triggers before even loading into the instance

[GwynUnlucky]

Date & Time: November 12, 4:14 PM (MST)
Frequency: Only once (so far)
World name: Cactuar
Character name: Gwyn Unlucky
Monster name: Deep Palace Manticore, Deep Palace Keeper
Class/Level: Machinist 80
Party or solo: Solo
In-game time: 11:52 am
Area and coordinates: Palace of the Dead, Floor 141
Steps:
1. Begin Palace of the Dead Floor 141-150 (This particular run was also deathless, I was gunning for the Necromancer title)
2. That's it, that's all I did. Maybe move around in the blue loading circle?

Attached screenshot. Pay close attention to the chat log, where the message for luring trap trigger is displayed before even the message for duty beginning has.