Reproduction steps:
1. Open the attached “BugRepro” project
2. Open the “Assets/Scenes/SampleScene.unity” Scene
3. Select “Sphere” GameObject in the Hierarchy window
4. Double-click on the “CopyTo” material under the Materials section in the Inspector window
5. Observe the Console window
Expected result: No error is thrown
Actual result: “Material 'CopyTo' with Shader 'Test/CopyTo' doesn't have a color property '_Color2'“ error is thrown
Reproducible with: 2022.3.30f1, 6000.0.5f1
Couldn't test with: 2021.3.39f1 (Script can’t be loaded)
Reproducible on: Windows 11
Not reproducible on: No other environment tested