Advent Cakes Firework does not rotate in gpose

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Date & Time: 1/10/2021
Frequency: Every time attempted
World name: Balmung
Character name: Body Count
Class/Level: 49 WAR
Party or solo: Solo
Steps:
1. Use Magicked Prism (Advent Cakes)
2. Go into Gpose
3. Rotate to -90 degrees to create a vertical
4. Firework effect does not rotate correctly at all

Expected result as shown in unrotated Gpose:
https://64.media.tumblr.com/392bd58a...ccc05c0e16.png

Firework effect when rotated 90 degrees:
https://64.media.tumblr.com/59f59f92...8aa799f888.png