Arm animations break shoulder mesh on Vanguard Fending/Maiming armor

Date & Time: 13/11/2024, exact time not relevant
Frequency: Can be reproduced at any time
World name: Zodiark
Character name: Thea Pico
Class/Level: Warrior/Dragoon/Paladin, 100
Steps:
1. Equip the Vanguard Armor of Fending or Maiming as your visual appearance.
2. Perform an animation that crosses your arms, such as /lean, or certain cutscene gestures.
3. The spiked mesh on the character's right shoulder will twist out of shape on a lower point.
Note: Only tested on female hrothgar.

https://i.imgur.com/BkR1ghB.png

Edit: I'm realizing the spiked mesh appears to have a twisting issue even in idle animations. I checked an NPC in Solution Nine, and it appears to affect them equally.
https://i.imgur.com/QZAkz02.png

■ PC Specs

To obtain the system information, open the FFXIV launcher and select Config → System Information → Display.

-=-=-=-=-=-=- System Information -=-=-=-=-=-=-

SYSTEM_OS Windows 10 Home 64-bit (6.2, Build 9200) (19041.vb_release.191206-1406)
SYSTEM_CPU Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (4 CPUs), ~3.2GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 4 SYSTEM_CORE_PHYSICS 4
SYSTEM_BIOS BIOS Date: 08/31/15 14:15:40 Ver: 05.0000B
SYSTEM_LANGUAGE dansk (Regional Setting: dansk)
SYSTEM_MEMORY 16238.672MB
SYSTEM_VIRTUAL_MEMORY 134217727.875MB
SYSTEM_PAGE_FILE 18670.672MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 223.003GB SYSTEM_FREEDISC_SPACE 53.317GB
SYSTEM_STORAGE D:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 0.488GB SYSTEM_FREEDISC_SPACE 0.453GB
SYSTEM_STORAGE F:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1862.019GB SYSTEM_FREEDISC_SPACE 423.817GB
SYSTEM_DIRECTX_VERSION DirectX 12
SYSTEM_GRAPHICS NVIDIA GeForce GTX 960
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY2
SYSTEM_GRAPHICS_CHIP NVIDIA GeForce GTX 960
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 1995.062 MB
SYSTEM_GRAPHICS_SHARED_VRAM 8119.336 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 1920 x 1200 (32 bit) (59Hz)
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_ab3196e1830c9b6c\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_ab3196e1830c9b6c\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_ab3196e1830c9b6c\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_ab3196e1830c9b6c\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 32.00.0015.6603
SYSTEM_GRAPHICS_DRIVER_DATE 10/15/2024 01:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_GRAPHICS Intel(R) HD Graphics 530
SYSTEM_GRAPHICS_DEVICE Unknown
SYSTEM_GRAPHICS_CHIP Intel(R) HD Graphics Family
SYSTEM_GRAPHICS_MAKER Intel Corporation
SYSTEM_GRAPHICS_VRAM 8247 MB
SYSTEM_GRAPHICS_SHARED_VRAM SYSTEM_UNKNOWN
SYSTEM_GRAPHICS_DAC Internal
SYSTEM_GRAPHICS_DISPLAY_MODE Unknown
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\iigd_dch.inf_amd64_51f685305808e3a5\igdumdim64.dll,C:\WINDOWS\System32\DriverStore\FileRepository\iigd_dch.inf_amd64_51f685305808e3a5\igd10iumd64.dll,C:\WINDOWS\System32\DriverStore\FileRepository\iigd_dch.inf_amd64_51f685305808e3a5\igd10iumd64.dll,C:\WINDOWS\System32\DriverStore\FileRepository\iigd_dch.inf_amd64_51f685305808e3a5\igd12umd64.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 31.00.0101.2111
SYSTEM_GRAPHICS_DRIVER_DATE 7/19/2022 01:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English

SYSTEM_GRAPHICS_PIXEL_SHADER
SYSTEM_GRAPHICS_VERTEX_TEXTURE
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-