Steps to reproduce:
1. Create a new AR Mobile template project
2. Change the platform to macOS dedicated server
3. Build the project
4. Observe the Console

Actual results: 
{code:java}
The following asset(s) located in immutable packages were unexpectedly altered. Making changes to immutable packages isn't recommended because the changes can be lost without any warning during Package Manager operations.
  Packages/com.unity.xr.arfoundation/Assets/Materials/SimulationLitGray.mat
  Packages/com.unity.xr.arcore/Tests/Editor/Assets/TestReferenceImageLibrary.asset {code}
 warning is thrown
Expected results: No errors or warnings are thrown

Reproducible with versions: 6.0.3 (6000.0.26f1), 6.1.0-pre.5 (6000.0.40f1, 6000.1.0b8, 6000.2.0a5)
Not reproducible with versions: 5.1.6 (2022.3.59f1, 2021.3.49f1), 6.0.3 (6000.0.25f1)

Tested on (OS): macOS Sequoia 15.3 (Intel), Windows 10

Note: FAV is in editor versions

{}Opening Mixed Reality and VR template on 6000.4.0b4 also produces this warning{}:
"The following asset(s) located in immutable packages were unexpectedly altered. Making changes to immutable packages isn't recommended because the changes can be lost without any warning during Package Manager operations.
Packages/com.unity.xr.androidxr-openxr/Assets/URP/UniversalRenderPipelineAsset.asset"