“NullReferenceException” errors thrown when adding “Content Packing & Loading” Schema to AddressableAssetGroupTemplate.asset

Steps to reproduce:
1. Create new Unity project
2. Install Addressables package via Package Manager
3. Right-click in Project window, navigate to Create > Addressables > Group Templates > 4. Create Blank Group Template
5. Make sure AddressableAssetGroupTemplate.asset is selected in Project window
6. In Inspector window press on “Add Schema” button
7. From the menu select “Content Packing & Loading”
8. Observe the Console window

Actual results: “NullReferenceException: Object reference not set to an instance of an object” errors are spammed in the Console window
Expected results: No errors are thrown in the Console window

Reproducible with versions: 6000.0.62f1, 6000.2.12f1, 6000.3.0b9, 6000.4.0a4

Tested on (OS): macOS Silicon Tahoe 26.0 (M1)