Mangohud prevents Feral Launcher games from running

[zoobporsor]

Do not report issue for old MangoHud versions

Describe the bug
Whenever a game uses Feral launcher (Shadow of the Tomb raider, Rome TW Remastered) the game will not run.

For instance, Shadow of Tomb Raider, the launcher will appear, but when I click play the game does not show up but steam says it is still running until I decide to quit it.
Unsetting mangohud %command% from steam launch command makes the game work as normal.

List relevant hardware/software information

• Arch Linux/KDE Plasma/Wayland
• MangoHud version , the latest one that comes with Arch sorry not sure how to check right now
• GPU , Nvidia Rtx 2080ti

To Reproduce
Steps to reproduce the behavior:

1. Go to Feral launcher game (Shadow of tomb raider for example)
2. Click on '....' set launch options mangohud %command%
3. Launcher appears, click Play
4. Nothing happens

Expected behavior
Game launches

Screenshots

after clicking play, nothing happens.

Additional context
Seen someone else mention the same problem with another Feral Launcher game , Rome TW Remastered

[pruebahola]

Happens also with Total War Warhammer 2