Orthographic Projection affects CameraCullPlanes when using custom Projection

Steps to reproduce:
1. Open the attached project “IssueProject“
2. Open the “Assets/Scenes/SampleScene.unity“ Scene
3. In the Hierarchy window expand the “CameraRig“ GameObject and select the “Main Camera“ GameObject
4. In the Inspector window set the Projection to Orthographic
5. Change the Size value while looking at the “Camera Cull Planes” list values
6. “Camera Cull Planes” list values are synced
7. Enable the “Use custom Proj“ option
8. Change the Size value while looking at the “Camera Cull Planes” list values
9. “Camera Cull Planes” list values are still affected

Expected result: CameraCullPlanes are not affected by Orthographic Projection when using a custom Projection
Actual result: Orthographic Projection affects CameraCullPlanes when using custom Projection

Reproducible with: 2021.3.19f1
Couldn’t test with: 2020.3.46f1, 2022.2.9f1, 2023.1.0b7, 2023.2.0a4 (couldn’t upgrade/downgrade the URP package because it’s custom)

Reproducible on: Windows 10

Notes:
1. Only reproducible with the custom URP 12.1.8 package
2. Issue does not occur when using Perspective Projection