Summary

Building a minimal scene for Android results in the following Console 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.arcore/Tests/Editor/Assets/TestReferenceImageLibrary.asset

Steps to reproduce:

1. Open the attached BIRP_ARcore project.
2. Build Settings > Android > Switch Platform.
3. Build Settings > Build. 

Actual results: 

Notice the Console warning.

Expected results: 

Released packages should refrain from throwing Console warnings. 

Reproducible with versions: 

Unity 2022.3.62f1 with ARcore 5.2.0.

Unity 6000.0.53f1 with ARcore 6.0.6.

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Android. 

Notes:

• The repro project is just the Built-in Render Pipeline template with ARcore added.  
• Same warning occurs with ARkit; see ARKB-96.