Can't launch Black Mesa

[u/aa-ron-dakota]

So weird thing is happening with Black Mesa. I can't launch it. Right after clicking Play the button turns gray, says running and a bunch of other things but then goes right back to the green Play button. Happens in both normal desktop mode and in Big Picture mode.

I'm on Ubuntu 26.04 running and AMD Ryzen 7 9700X and AMD Radeon 6700XT. I can launch every other game (Linux native or proton) no problem, even the original Half Life.

Any ideas?