How to reproduce:
1. Create a new project
2. Import any FBX file to the Editor
3. Create a Prefab, by dragging the FBX file into the Hierarchy tab and back to the Project tab
4. Inspect the Prefab file using Notepad
5. Observe the Notepad
Expected results: All position and rotation values are non-negative-zero
Actual results: Position and rotation values are negative-zero
Reproducible in: 2021.3.35f1, 2022.3.20f1, 2023.2.12f1, 2023.3.0b9
Reproduced on: Windows 11 Pro (23H2)
Not reproduced on: No other environment tested
Note: FBX files generated in other 3D modeling applications yield the same results