GLTF/GLB Generation does not place bottom-layer components properly

- [ ] Reproduce with visual snapshot
- [ ] Fix

https://tscircuit.com/editor?package_id=c62659cd-a393-465a-b94d-046efd0b28b9

<img width="2196" height="1812" alt="Image" src="https://github.com/user-attachments/assets/88d6ecfd-e6fb-4f89-9da9-e29a26c26084" />

/bounty $40