Reproduction steps:
1. Open the attached project "canvasTest.zip"
2. In the Project window, double-click "Canvas.prefab"
3. In the Hierarchy select the "childCanvas" GameObject
4. Change any of the values of the Transform Component in the Inspector
5. Exit Prefab Mode and open the Prefab again
6. Observe the values of the "childCanvas" Transform Component

Expected result: Changes to values are saved
Actual result: Changes to values are not saved

Reproducible with: 2022.1.0a6, 2022.1.0f1, 2022.2.0a12
Not reproducible with: 2019.4.38f1, 2020.3.34f1, 2021.3.1f1, 2022.1.0a5

Notes:
- When creating the Prefab, the values of the Child Canvas Prefab are set to 0