I suspect you have installed either Lutris or Steam through flatpak.
Try installing both using the same method or install MangoHud both as a flatpak and a system package.
Also, I recommend enabling MangoHud with 'MANGOHUD=1 %command%' instead.
Yeah, was gonna say the same. It works fine for me on native steam. But flatpak steam needs flatpak mangohud. This was actually one of the reasons that I stopped using flatpak steam though. Not a problem against flatpaks or even that it didn't work. Hell it worked even during times when native steam didn't work.
However, lots of small differences like this kinda make it harder to utilize existing software and information when the software and the communities around that software don't have flatpak in mind.
Steam has it's own copy of mangohud in the launch env, that messes with locally installed version, you have to uninstall the local version for it to work in steam last I checked
Have you tried with the --dlsym flag? Also check if mangohud works on the vkcube and glxgears demo first.
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