“InvalidOperationException: Cannot modify library assets.” errors are thrown when selecting any asset in the Asset Manager’s External Libraries

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Install the Asset Manager package (com.unity.asset-manager-for-unity)
3. Open the Asset Manager window (Window > Asset Manager)
4. Select any asset in the External Libraries
5. Observe the Console window

Actual results: “InvalidOperationException: Cannot modify library assets.” errors are thrown

Expected results: No errors are thrown

Reproducible with versions: 1.11.0 (6000.0.76f1, 6000.3.17f1, 6000.4.10f1, 6000.5.0b11, 6000.6.0a4, 6000.6.0a6)

Not reproducible with versions: 1.9.2 (6000.5.0a5), 1.10.0 (6000.5.0a5, 6000.6.0a4)

Tested on (OS): MacOS Silicon Tahoe 26.3, Windows 11