When submitting a bug report, please use the below template and thoroughly fill out the necessary information.

Date & Time: 20/05/18 ; 22:45pm-00:00am (and other nights)
Frequency: always
World name: Moogle
Character name: Ceasaria Pheonixia
Monster name: Demon Chadarnouk
Class/Level: AST/70
Party or solo: 8 man
Area and coordinates: O6S
Steps:
1. Earthly Star put
2. Take the mount
3. Eartly Star disappears

* My co-healer SCH had the same problem. During Fey Union, if she takes the mount, Fey Union disappears. In my opinion, the result will be the same with Shadow Flare, Sacred Soil and Asylum.*

■ PC Specs

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

-=-=-=-=- System Information -=-=-=-=-
SYSTEM_OS Windows 8.1 64 bits (6.2, version 9200) (9600.winblue_ltsb_escrow.180302-1800)
SYSTEM_CPU Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz (8 CPUs), ~3.6GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 8 SYSTEM_CORE_PHYSICS 4
SYSTEM_BIOS 0401
SYSTEM_LANGUAGE français (Paramètres régionaux*: français)
SYSTEM_MEMORY 16261.176MB
SYSTEM_VIRTUAL_MEMORY 134217727.875MB
SYSTEM_PAGE_FILE 18693.176MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 150.000GB SYSTEM_FREEDISC_SPACE 20.739GB
SYSTEM_STORAGE D:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 762.441GB SYSTEM_FREEDISC_SPACE 14.859GB
SYSTEM_DIRECTX_VERSION DirectX 11
SYSTEM_GRAPHICS NVIDIA GeForce GTX 780
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP GeForce GTX 780
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 2971.363 MB
SYSTEM_GRAPHICS_SHARED_VRAM 8130.588 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 1920 x 1080 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
SYSTEM_GRAPHICS_DRIVER_VERSION 23.21.0013.9124
SYSTEM_GRAPHICS_DRIVER_DATE 16/03/2018 19:58:06
SYSTEM_GRAPHICS_DRIVER_LANGUAGE Anglais
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_SOUND Speakers (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {99A05B37-AF76-4D63-A896-8CC67C6B04A1}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.7272
SYSTEM_SOUND_DRIVER_LANGUAGE Anglais
SYSTEM_SOUND_DRIVER_DATE 17/06/2014 13:27:12
SYSTEM_SOUND VS278 (NVIDIA High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {5A50223C-F6FA-4AD2-99F4-AFBC8F7A27DA}
SYSTEM_SOUND_DEVICE_NAME nvhda64v.sys
SYSTEM_SOUND_DRIVER_VERSION 1.03.0036.0006
SYSTEM_SOUND_DRIVER_LANGUAGE Anglais
SYSTEM_SOUND_DRIVER_DATE 24/01/2018 02:19:35
SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Souris
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 3 SYSTEM_GAMEPAD_BUTTON 5 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Clavier
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 128 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {700A4330-FE5A-11E4-8001444553540000}
SYSTEM_INPUT_NAME Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 573 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {70112100-FE5A-11E4-8002444553540000}
SYSTEM_INPUT_NAME Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {70125980-FE5A-11E4-8003444553540000}
SYSTEM_INPUT_NAME Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {2AEB2D30-B50F-11E4-8002444553540000}
SYSTEM_INPUT_NAME USB Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 897 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {2AF08460-B50F-11E4-8003444553540000}
SYSTEM_INPUT_NAME USB Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 3 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {2AF1BCE0-B50F-11E4-8004444553540000}
SYSTEM_INPUT_NAME USB Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-