Bazzite Gamescope Overlay is showing values of iGPU instead of eGPU

[baustoff]

Describe the bug
I'm running Bazzite (deck-image) on a MiniPC (AMD 8845HS APU), which is connected to a eGPU (AMD 7800 XT via OcuLink).
Everything is running well, however since almost 3-4 weeks the performance overlay in gamemode is showing the values of the iGPU (usage, vram, mhz, temps) instead of the eGPU no matter which preset I choose. I don't use any environment variables.
I didn't change anything and my TV is only connected via HDMI to the eGPU.

List relevant hardware/software information

• Bazzite deck-image KDE (Stable - F41.20250121)
• MangoHud version 0.7.2
• eGPU: AMD 7800 XT
• APU: 8845HS with 780M as iGPU (GMKTec NucBox K8 Plus)

Expected behavior
I expected gamescope overlay showing performance values of my eGPU

Additional context
This issue only appears in gamemode. In desktopmode it's showing me correct eGPU values when I use mangohud %command% as environment variable in games.
In another try I identified the eGPU (03:00.0), created the MangoHUD folder (/home/user/.config/MangoHud) and copied the example config file from /usr/share/doc/mangohud/ to that folder and changed the filename extension from MangoHud.conf.example to MangoHud.conf .
Inside of that .conf file I uncommented and changed the line # pci_dev=0:0a:0.0 to pci_dev=0:03:00.0. I saved it and afterwards I restarted the whole system. Booted in to game mode, started a game...and performance overlay still directing to iGPU. This config file seems to have effect only in dekstopmode, because for testing I changed pci_dev to my iGPU and after starting a game in desktop mode, mangohud is showing values of the iGPU.