Steps to reproduce:
1, Create new Unity project using empty URP 3D Template
2. Open Package Manager window
3. Find and install “Animation Rigging” package
4. Once installed, import “Animation Rigging Contraint Samples”
5. Open any sample scene for Animation Rigging (for example Aim.unity scene)
6. Observe the Scene

Actual results: objects in the Scenes are rendered in magenta color
Expected results: objects should have working materials on them

Reproducible with versions: 1.3.1 (6000.0.60f1, 6000.2.9f1, 6000.3.0b7, 6000.4.0a3)

Tested on (OS): Windows 11