google / google/model-viewer

ar-placement ignored on quick look

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Description

### Description

It seems that the `ar-placement` option gets ignored on AR Quick Look. Is this a bug or intended behaviour? If it's intended, the documentation should mention that imo. If it's not implemented yet, it should at least be possible to make it available when converting the .glb to .usdz file, because the placement info is embedded into the .usdz file for Quick Look.

#### Live Demo
on iOS doesn't show the vertical wall, but the horizontal floor at the onboarding animation:
https://modelviewer.dev/examples/augmentedreality/index.html#wall

### Version
- model-viewer: v2.1.1

### Browser Affected

- [ ] Chrome, version: xx.x.xxxx.xx
- [ ] Edge
- [ ] Firefox
- [ ] IE
- [x] Safari

### OS

- [ ] Android
- [x] iOS 16.0 iPhone XR
- [ ] Linux
- [ ] MacOS
- [ ] Windows

### AR

- [ ] WebXR
- [ ] SceneViewer
- [x] QuickLook

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