[URP] UrpでVrm0のEditorImportがエラーになる

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環境情報

• UniVRM version: 0.121.0
• Unity version: Unity-2021.3
• OS: Windows 11

バグについて

Exception: UnityEngine.Texture:Sphere is not converted.
UniGLTF.TextureExtractor.Extract (VRMShaders.SubAssetKey key, VRMShaders.TextureDescriptor texDesc) (at Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/TextureExtractor.cs:62)
UniGLTF.TextureExtractor.ExtractTextures (UniGLTF.GltfData data, UniGLTF.UnityPath textureDirectory, UniGLTF.ITextureDescriptorGenerator textureDescriptorGenerator, System.Collections.Generic.IReadOnlyDictionary`2[TKey,TValue] subAssets, System.Action`2[T1,T2] addRemap, System.Action`1[T] onCompleted) (at Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/TextureExtractor.cs:84)
VRM.VRMEditorImporterContext.ConvertAndExtractImages (System.Action`1[T] onTextureReloaded) (at Assets/VRM/Editor/Format/VRMEditorImporterContext.cs:114)
VRM.vrmAssetPostprocessor.ImportVrmAndCreatePrefab (System.String vrmPath, UniGLTF.UnityPath prefabPath) (at Assets/VRM/Editor/Format/vrmAssetPostprocessor.cs:102)
VRM.vrmAssetPostprocessor.ImportVrm (UniGLTF.UnityPath vrmPath) (at Assets/VRM/Editor/Format/vrmAssetPostprocessor.cs:57)
VRM.vrmAssetPostprocessor.OnPostprocessAllAssets (System.String[] importedAssets, System.String[] deletedAssets, System.String[] movedAssets, System.String[] movedFromAssetPaths) (at Assets/VRM/Editor/Format/vrmAssetPostprocessor.cs:37)