This issue was multi-factorial but mostly came down to Unity's thread priorities being wrong. This was fixed in 2022.3/staging, and landed in 2022.3.41
Reproduction steps:
1. Open the attached “Repro“ project
2. Build the project on “visionOS” platform (File > Build Settings > visionOS > Build)
3. Run the build on an Apple Vision Pro device
4. Look around and observe the rectangle in front of you
Expected result: The rectangle stays in the center and follows the camera smoothly
Actual result: The rectangle jitters
Reproducible with: 1.2.3 (2022.3.28f1)
Reproducible on: VR on Apple Vision Pro device (User’s platform)
Not reproducible on: VR on visionOS 1.1 Simulator
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Have a workaround or additional info about this issue?