GodSoul EMU_MISSING_INTERFACE

[ZhReimu]

Describe the bug
When I launch the game using steamclient_loader_x64.exe, the game first displays two pop-up windows with the following content, and then continues to run:

--------------------

INTERFACE=SteamSteamVRPrivate002
CALLER FN=Steam_NotifyMissingInterface()
APPID=1213300
TIME=2025/12/19 - 02:06:37
--------------------

INTERFACE=SteamSteamVRPrivate001
CALLER FN=Steam_NotifyMissingInterface()
APPID=1213300
TIME=2025/12/19 - 02:06:39
--------------------

Although the game continues to run, it seems to automatically launch a second game instance after a few seconds, and sometimes even a third. This also happens when I execute steamclient_loader_x64.exe from the command line (cmd), which rules out the possibility of an accidental double-click.

According to Process Monitor, steamclient_loader_x64.exe is launched twice. The command line for the first instance is:

Parent PID:	1988
Command line:	steamclient_loader_x64.exe  
Current directory:	E:\Games\SteamFreeGames\GodSoul\
Environment:	

The second instance is:

Parent PID:	7044
Command line:	"E:\Games\SteamFreeGames\GodSoul\steamclient_loader_x64.exe" -- "steam://vr_connection_ready/~10400~10400~0,0,1~~~~MID0EBhVAt_S5hJhyrFl9ckYzU-loFJzuRDGTbWXGcet3PM="
Current directory:	D:\Program Files\Steam\steamapps\common\SteamVR\
Environment:

Emulator version
release-2025_11_27

Debug log

--------------------

INTERFACE=SteamSteamVRPrivate002
CALLER FN=Steam_NotifyMissingInterface()
APPID=1213300
TIME=2025/12/19 - 02:06:37
--------------------

INTERFACE=SteamSteamVRPrivate001
CALLER FN=Steam_NotifyMissingInterface()
APPID=1213300
TIME=2025/12/19 - 02:06:39
--------------------

steam_settings file

steam_settings.zip

Infos
The game SteamAppId: 1213300
The game using Denuvo: No

Requirement
Set x what you completed

• like this
• I am uploaded debug log.
• I am uploaded steam_setting file.
• I am sure the game not using 3rd party server (Photon, Playfab, GC, etc).
• I am sure can run the game offline.

To Reproduce
Steps to reproduce the behavior:

1. download game, and copy GSE files, complete settings
2. click steamclient_loader_x64.exe
3. See error

Expected behavior
no error dialogs, no two even more instants

Screenshots

Additional context
Add any other context about the problem here.

[Detanup01]

those two interface not public to seen.
Only can be added if someone is reversed that interface