“NullReferenceException” error and warnings thrown then opening Addressables Report window

Steps to reproduce:
1. Create new Unity project
2. Install Addressables package via Package Manager
3. Open “Addressables Report” window (Window > Asset Management > Addressables > Addressables Report)
4. Observe the Console window

Actual results: “NullReferenceException” error and “Control UnityEditor.AddressableAssets.GUIElements.RibbonButton uses the deprecated UxmlTraits API. “ warnings are thrown when opening Addressables Report window
Expected results: No warnings or errors are thrown in the Console window

Reproducible with versions: 6000.4.0a2, 6000.4.0a4
Not reproducible with versions: 6000.3.0b9
Can’t test with versions: 6000.4.0a1 (project opens with corrupted packages, unable to open addressable windows)

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