That's extremely weird. it's probably because i tried to add discord rich presence bullshit though it wasn't supposed to be for the demo. If it's force opening discord though i'm just going to remove it, it's supposed to be "if you already have discord open" not "open discord". Thanks for the find. I can't get it to crash though, can you send the crashdump?
Edit: I uploaded a new build where this should be fixed
I would think that's the VR support triggering it. Normally in steam we use -nohmd as a default launch option unless people select VR, but in the demo it's just running the .exe directly. I don't have my VR installed on this pc right now so i didn't notice that it was launching steamvr on the demo. You can launch the .exe with -nohmd and it will not start steamvr, i will figure out how to fix this for a next version.