材质球向shader传值失败

unity中导入spine模型，当模型挂载SkeletonMecanim组件后，发现材质球向shader传值失败，改为SetPropertyBlock后可行。

//spine模型使用材质球传参数，当spine模型上挂载有SkeletonMecanim的情况下，会传值失败!!!!
        // foreach (var mat in m_SkinMaterials)
        // {
        //     int ShenshiIntensity = Shader.PropertyToID("_ShenshiIntensity");
        //     mat.SetFloat(ShenshiIntensity, _value);
        // }
        
        int ShenshiIntensity = Shader.PropertyToID("_ShenshiIntensity");
        List<Renderer> rendererList = m_Actor.GetAllRenderer();
        for (int i=0;i<rendererList.Count;++i)
        {
            MaterialPropertyBlock pb = new MaterialPropertyBlock();
            pb.SetFloat(ShenshiIntensity, _value);
            rendererList[i].SetPropertyBlock(pb);
        }