How to reproduce:
1. Open the user's attached project "URPRenderObjectsPrefabBug.zip"
2. Open the "SampleScene" Scene
3. In the Hierarchy window under "Canvas" select "Transparent UI Asset" and press the arrow button next to the Prefab
Expected result: The transparent Image Prefab is rendered in front of the opaque "Cube"
Actual result: The transparent Image Prefab is rendered behind the opaque "Cube"
Reproducible with: 10.8.1 (2020.3.27f1), 12.1.2 (2021.2.7f1), 12.1.3 (2021.2.8f1), 12.1.4 (2021.2.9f1), 13.1.2 (2022.2.0a2), 13.1.5 (2022.1.0b5)
Could not test with: 7.7.1 (2019.4.35f1) Context Prefab Mode not available