I've tried it with only FFXIV running, it still happens. I've lowered gfx settings to minimum, it still happens. I've had multiple other people with varied systems replicate it happening when they follow those steps, so it's most likely not system-dependent. I've even had other people do complete reinstalls and still encounter exact same issue.

Here is my personal system info:

Code:
-=-=-=-=-=-=- FFXIV Information -=-=-=-=-=-=-

MyDocument	C:\Users\eiral\Documents
FINAL FANTASY XIV - A Realm Reborn	E:\Program Files (x86)\SquareEnix
FINAL FANTASY XIV - A Realm Reborn	Language 1		Region 3
ProxyEnable 0
ProxyServer unspecified
ProxyOverride unspecified


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

SYSTEM_OS	Windows 10 Home 64 bitar (6.2, version 9200) (19041.vb_release.191206-1406)
SYSTEM_CPU	AMD Ryzen 5 1600 Six-Core Processor             (12 CPUs), ~3.2GHz
SYSTEM_CORE_NUM	SYSTEM_CORE_LOGIC 12  SYSTEM_CORE_PHYSICS 6
SYSTEM_BIOS	0806
SYSTEM_LANGUAGE	svenska. Nationell inställning: svenska
SYSTEM_MEMORY	16320.223MB
SYSTEM_VIRTUAL_MEMORY	134217727.875MB
SYSTEM_PAGE_FILE	18752.223MB
SYSTEM_STORAGE	C:\    SYSTEM_HARDDISK_DRIVE    SYSTEM_TOTALDISC_SPACE 231.768GB    SYSTEM_FREEDISC_SPACE 141.685GB
SYSTEM_STORAGE	E:\    SYSTEM_HARDDISK_DRIVE    SYSTEM_TOTALDISC_SPACE 2794.394GB    SYSTEM_FREEDISC_SPACE 2422.984GB
SYSTEM_DIRECTX_VERSION	DirectX 12
SYSTEM_GRAPHICS	NVIDIA GeForce GTX 1070
SYSTEM_GRAPHICS_DEVICE	\\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP	NVIDIA GeForce GTX 1070
SYSTEM_GRAPHICS_MAKER	NVIDIA
SYSTEM_GRAPHICS_VRAM	8088.000 MB
SYSTEM_GRAPHICS_SHARED_VRAM	8160.111 MB
SYSTEM_GRAPHICS_DAC	Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE	1920 x 1080 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER	C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1108979a670abe46\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1108979a670abe46\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1108979a670abe46\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1108979a670abe46\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION	27.21.0014.6663
SYSTEM_GRAPHICS_DRIVER_DATE	5/27/2021 02:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE	Engelska
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER	3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE	SYSTEM_SUPPORT
SYSTEM_SOUND	Högtalare (SteelSeries Siberia 800)
SYSTEM_SOUND_DEVICE_ID	{39926738-4ECB-4DBF-8805-DDDAB80D8D22}
SYSTEM_SOUND_DEVICE_NAME	USBAUDIO.sys
SYSTEM_SOUND_DRIVER_VERSION	10.0.19041.964
SYSTEM_SOUND_DRIVER_LANGUAGE	Engelska
SYSTEM_SOUND_DRIVER_DATE	4/22/2021 02:00:00
SYSTEM_SOUND	Hörlurar på headset (Wireless Controller)
SYSTEM_SOUND_DEVICE_ID	{E345F2E2-1EF9-41FB-A1C0-5B7E97B107DF}
SYSTEM_SOUND_DEVICE_NAME	USBAUDIO.sys
SYSTEM_SOUND_DRIVER_VERSION	10.0.19041.964
SYSTEM_SOUND_DRIVER_LANGUAGE	Engelska
SYSTEM_SOUND_DRIVER_DATE	4/22/2021 02:00:00
SYSTEM_SOUND	Realtek HDMI Output (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID	{AC0D38FA-6CA2-42A3-9CC5-6292EBB0C547}
SYSTEM_SOUND_DEVICE_NAME	RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION	6.0.1.8142
SYSTEM_SOUND_DRIVER_LANGUAGE	Engelska
SYSTEM_SOUND_DRIVER_DATE	5/2/2017 02:00:00
SYSTEM_INPUT	{6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME	Mus
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 3  SYSTEM_GAMEPAD_BUTTON 8  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME	Tangentbord
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 128  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{03B8AC50-D08D-11E7-8003444553540000}
SYSTEM_INPUT_NAME	Hid Interface
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 5  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{03B63B50-D08D-11E7-8002444553540000}
SYSTEM_INPUT_NAME	ndPoint1 Inte
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 3  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{03B8AC50-D08D-11E7-8008444553540000}
SYSTEM_INPUT_NAME	ndPoint1 Inte
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 6  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{03B8AC50-D08D-11E7-8005444553540000}
SYSTEM_INPUT_NAME	SteelSeries Siberia 800
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 0  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{C5F63520-4F26-11EA-8001444553540000}
SYSTEM_INPUT_NAME	USB Receiver
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 767  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{C5F7BBC0-4F26-11EA-8002444553540000}
SYSTEM_INPUT_NAME	USB Receiver
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 0  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{C5F7E2D0-4F26-11EA-8003444553540000}
SYSTEM_INPUT_NAME	USB Receiver
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 3  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{C5F830F0-4F26-11EA-8004444553540000}
SYSTEM_INPUT_NAME	USB Receiver
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 0  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{C5F85800-4F26-11EA-8005444553540000}
SYSTEM_INPUT_NAME	USB Receiver
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 0  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{C5F87F10-4F26-11EA-8006444553540000}
SYSTEM_INPUT_NAME	USB Receiver
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 0  SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT	{2EBE9CF0-780E-11E9-8001444553540000}
SYSTEM_INPUT_NAME	Wireless Controller
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 6  SYSTEM_GAMEPAD_BUTTON 14  SYSTEM_GAMEPAD_FOV 1
SYSTEM_INPUT	{03B8AC50-D08D-11E7-8009444553540000}
SYSTEM_INPUT_NAME	SteelSeries Siberia 800
SYSTEM_INPUT_REMARKS	SYSTEM_GAMEPAD_AXIS 0  SYSTEM_GAMEPAD_BUTTON 0  SYSTEM_GAMEPAD_FOV 0


-=-=-=-=-=-=- Application Information -=-=-=-=-=-=-

FFXIVLauncher
CN=Microsoft Windows, O=Microsoft Corporation, L=Redmond, S=Washington, C=US
FINAL FANTASY XIV
MainWindow
Microsoft Text Input Application
Inställningar
forming-castrum-run - Discord
Consistent, replicate-able DX Error with Gathering Log — Mozilla Firefox
Filmer


-=-=-=-=-=-=- Install Information -=-=-=-=-=-=-

Google Chrome
K-Lite Codec Pack 16.1.2 Standard
Microsoft Edge
Microsoft Edge Update
OBS Studio
Overwolf
SpeedFan (remove only)
Steam
Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.30501
Microsoft Visual C++ 2019 X86 Minimum Runtime - 14.28.29334
Microsoft Visual C++ 2013 x86 Minimum Runtime - 12.0.21005
Microsoft Visual C++ 2019 X86 Additional Runtime - 14.28.29334
Java 8 Update 281
FINAL FANTASY XIV - A Realm Reborn
Microsoft XNA Framework Redistributable 4.0
Microsoft Visual C++ 2012 Redistributable (x86) - 11.0.61030
Java Auto Updater
Gyazo 4.2.0.0
Microsoft Visual C++ 2005 Redistributable
Minecraft
BankID säkerhetsprogram
Microsoft Visual C++ 2008 Redistributable - x86 9.0.30729.6161
Microsoft Visual C++ 2015-2019 Redistributable (x64) - 14.28.29334
Microsoft Visual C++ 2012 x86 Additional Runtime - 11.0.61030
Microsoft Visual C++ 2015-2019 Redistributable (x86) - 14.28.29334
Microsoft Visual C++ 2012 x86 Minimum Runtime - 11.0.61030
LOOT version 0.15.1
Microsoft Visual C++ 2012 Redistributable (x64) - 11.0.61030
Handelsbanken kortläsare
Microsoft Visual C++ 2010  x86 Redistributable - 10.0.40219
Realtek High Definition Audio Driver
Microsoft Visual C++ 2013 Redistributable (x86) - 12.0.30501
Microsoft Visual C++ 2013 x86 Additional Runtime - 12.0.21005
Bitwarden
Vortex
7-Zip 19.00 (x64)
Genshin Impact
Logitech Options
Mozilla Firefox 90.0 (x64 en-US)
Mozilla Maintenance Service
Notepad++ (64-bit x64)
Evoland Legendary Edition
Terraria
Ori and the Will of the Wisps
Lair of the Clockwork God
Celeste Original Soundtrack
Hades
Resident Evil Village
Devil's Kiss
Portal Reloaded
First Snow
Helltaker
Starbound
The Forest
Subnautica
No Man's Sky
Tales of Zestiria
Starbound - Unstable
Timespinner
Iconoclasts
Reveal The Deep
Helen's Mysterious Castle
Resident Evil 7 Biohazard
Tales of Berseria
Highway Blossoms
The Elder Scrolls V: Skyrim Special Edition
Celeste
Left 4 Dead 2
SteamWorld Dig 2
Portal 2
Disco Elysium
Raft
Bloodstained:  Ritual of the Night
Vigil: The Longest Night
Outer Wilds
Heaven's Vault
Blasphemous
Subnautica: Below Zero
Touhou Luna Nights
Valheim
Trials of Mana
Amnesia: Rebirth
SteelSeries Engine 3.20.0
VLC media player
Microsoft Visual C++ 2010  x64 Redistributable - 10.0.40219
Update for Windows 10 for x64-based Systems (KB4023057)
Java 8 Update 281 (64-bit)
Microsoft Visual C++ 2019 X64 Additional Runtime - 14.28.29334
Microsoft Visual C++ 2012 x64 Additional Runtime - 11.0.61030
Microsoft Visual C++ 2008 Redistributable - x64 9.0.30729.6161
Microsoft Visual C++ 2019 X64 Minimum Runtime - 14.28.29334
Microsoft Visual C++ 2013 x64 Additional Runtime - 12.0.21005
Microsoft Update Health Tools
Microsoft Visual C++ 2013 x64 Minimum Runtime - 12.0.21005
Microsoft Visual C++ 2005 Redistributable (x64)
Microsoft HEVC Media Extension Installation for Microsoft.HEVCVideoExtension_1.0.2512.0_x64__8wekyb3d8bbwe (x64)
NVIDIA Grafikdrivrutin 466.63
NVIDIA GeForce Experience 3.22.0.32
NVIDIA Optimus Update 38.0.7.0
NVIDIA PhysX systemprogramvara 9.19.0218
NVIDIA-uppdatering 38.0.7.0
NVIDIA FrameView SDK 1.1.4923.29781331
NVIDIA SHIELD Streaming
NVIDIA HD audiodrivrutin 1.3.38.60
NVIDIA Install Application
NVIDIA ABHub
NVIDIA Backend
NVIDIA Container
NVIDIA TelemetryApi helper for NvContainer
NVIDIA LocalSystem Container
NVIDIA Message Bus for NvContainer
NVAPI Monitor plugin for NvContainer
NVIDIA NetworkService Container
NVIDIA Session Container
NVIDIA User Container
NvModuleTracker
NVIDIA NodeJS
NVIDIA Watchdog Plugin for NvContainer
NVIDIA Telemetry Client
NVIDIA Virtual Host Controller
Nvidia Share
NVIDIA ShadowPlay 3.22.0.32
NVIDIA SHIELD Wireless Controller Driver
NVIDIA Update Core
NVIDIA Virtual Audio 4.13.0.0
Microsoft Visual C++ 2012 x64 Minimum Runtime - 11.0.61030


-=-=-=-=-=-=- Proccess Information -=-=-=-=-=-=-

C:\Program Files (x86)\Common Files\Java\Java Update\jucheck.exe	00002864
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe	00002700
C:\Program Files (x86)\K-Lite Codec Pack\Tools\CodecTweakTool.exe	00001D44
C:\Program Files (x86)\NVIDIA Corporation\NvNode\NVIDIA Web Helper.exe	00002090
C:\Program Files\Logitech\LogiOptions\LogiOptions.exe	00002534
C:\Program Files\Mozilla Firefox\firefox.exe	00002E0C
C:\Program Files\NVIDIA Corporation\NvContainer\nvcontainer.exe	000017F8
C:\Program Files\Realtek\Audio\HDA\RtkNGUI64.exe	00002480
C:\Program Files\SteelSeries\SteelSeries Engine 3\SteelSeriesEngine3.exe	00002628
C:\Program Files\WindowsApps\Microsoft.YourPhone_1.21042.137.0_x64__8wekyb3d8bbwe\YourPhone.exe	00002030
C:\Program Files\WindowsApps\Microsoft.ZuneVideo_10.21021.10311.0_x64__8wekyb3d8bbwe\Video.UI.exe	00000644
C:\ProgramData\Logishrd\LogiOptions\Software\Current\LogiOptionsMgr.exe	000025BC
C:\ProgramData\Logishrd\LogiOptions\Software\Current\LogiOverlay.exe	000025D4
C:\Users\eiral\AppData\Local\Discord\app-1.0.9002\Discord.exe	00002C94
C:\WINDOWS\Explorer.EXE	00001A20
C:\WINDOWS\System32\svchost.exe	00001A14
C:\WINDOWS\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe	00001F40
C:\WINDOWS\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe	00001CDC
C:\WINDOWS\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInputHost.exe	00002808
C:\WINDOWS\system32\ApplicationFrameHost.exe	000032A4
C:\WINDOWS\system32\DllHost.exe	00003100
C:\WINDOWS\system32\SearchFilterHost.exe	0000184C
C:\WINDOWS\system32\conhost.exe	0000229C
C:\WINDOWS\system32\ctfmon.exe	000019E0
C:\WINDOWS\system32\sihost.exe	00000394
C:\WINDOWS\system32\svchost.exe	00001760
C:\WINDOWS\system32\taskhostw.exe	000018A4
C:\Windows\ImmersiveControlPanel\SystemSettings.exe	0000310C
C:\Windows\System32\CompPkgSrv.exe	00002BE0
C:\Windows\System32\GameBarPresenceWriter.exe	00002AC4
C:\Windows\System32\RuntimeBroker.exe	000019B0
C:\Windows\System32\SecurityHealthSystray.exe	0000240C
C:\Windows\System32\oobe\UserOOBEBroker.exe	00002794
C:\Windows\System32\smartscreen.exe	000023D0
E:\Program Files (x86)\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\boot\ffxivlauncher.exe	00000D98
E:\Program Files (x86)\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\boot\ffxivsysinfo64.exe	000027F8
E:\Program Files (x86)\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv_dx11.exe	00001170