xr-environment attribute causes errors the second time a webxr session is started
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flag: not model-viewer
- Dominant language
- TypeScript
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Description
### Description
When using xr-environment attribute, reopening a webxr session (after having closed a previous one)
causes NPE errors in the console
#### Live Demo
https://modelviewer.dev/examples/augmentedreality/#ar
### Version
- model-viewer: v3.4.0
### Browser Affected
- [x] Chrome, version: 117
- [ ] Edge
- [ ] Firefox
- [ ] IE
- [ ] Safari
### OS
- [x] Android
- [ ] iOS
- [ ] Linux
- [ ] MacOS
- [ ] Windows
### AR
- [x] WebXR
- [ ] SceneViewer
- [ ] QuickLook
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