Reproduction steps:
1. Open the attached “USDTests” project
2. In the Project Window select the “Assets > USDImports > Root.usda” asset
3. In the top menu, select “USD > Export Selected with Children as USDA”
4. Select a location and name it “Root.usda”
5. Open the exported asset with a code or text editor
6. Search for the phrase “unity”

Expected result: The exported asset does not contain any metadata with the “unity” prefix
Actual result: The exported asset contains metadata with the “unity” prefix

Reproducible with: 1.0.0-exp.1 (2023.2.9f1, 2023.3.0b6)
Could not test with: 1.0.0-exp.1 (2021.3.35f1, 2022.3.20f1 (The package is not supported for these Editor versions))

Reproducible on: Windows 11, macOS Sonoma 14.1.2 (M2 (user’s))
Could not test with: macOS Sonoma 14.3 (“DllNotFoundException: UsdCs assembly:<unknown assembly> type:<unknown type> member:(null)” error is thrown when exporting)