Crossing a invisible wall in The Crown of the Immaculat(Normal mode)

Date & Time: 07/08/2019 around 9 PM PST
Frequency: Once
World name: Behemoth
Character name: Amalia B'nargin
Retainer name: N/A
NPC name: N/A
Monster name: Innocence
Class/Level: Dragoon level 80
Party or solo: Party
In-game time: N/A
Area and coordinates: The Crown of the Immaculat(Normal mode), around the southwest wall of the arena
Housing: N/A
Steps:
1. The boss started casting Beatific Vision
2. I turned my back around the southwest side of the arena and used Elusive Jump
3. The character passed trow the wall and died instantly

Explanation

After the boss started casting Beatific Vision, I used Elusive jump to gain distance between the middle of his path. Instead of stopping in the way it kept going trow outside the arena, killing the character in the end of the back flip. The character stayed floating while dead outside the arena after that, so I don`t know if a healer couldn`t resurrect or was too busy to do it. We wiped shortly after. Failed in trying to reproduce the bug.