Steps to reproduce:
- Clone and install repo
- Run
npm run dev
- Set up port forwarding as described in README
- Open meta headset browser to
http://localhost:8081 in browser
- Start AR session (works fine)
- Pres "Quit" button in toolbar at top
- ❌ Attempt to re-enter AR fails
Failed to execute 'requestSession' on 'XRSystem': There is already an active, immersive XRSession.

This 4-year-old stackoverflow question appears to encounter a similar issue.
FWIW I am seeing this in other applications as well.