diff --git a/Assets/VRM/UniGLTF/Editor/UniGLTFTests.cs b/Assets/VRM/UniGLTF/Editor/UniGLTFTests.cs
index 5df2d0a1d..ba9550f84 100644
--- a/Assets/VRM/UniGLTF/Editor/UniGLTFTests.cs
+++ b/Assets/VRM/UniGLTF/Editor/UniGLTFTests.cs
@@ -461,7 +461,7 @@ namespace UniGLTF
             var model = new glTFSkin()
             {
                 name = "b",
-                joints = new int[] {1},
+                joints = new int[] { 1 },
             };
 
             var json = model.ToJson();
@@ -482,7 +482,7 @@ namespace UniGLTF
             var model = new glTFSkin()
             {
                 name = "",
-                joints = new int[] {1},
+                joints = new int[] { 1 },
             };
 
             var json = model.ToJson();
@@ -523,7 +523,7 @@ namespace UniGLTF
             var model = new glTFSkin()
             {
                 name = "b",
-                joints = new int[] {},
+                joints = new int[] { },
             };
 
             var c = new JsonSchemaValidationContext("")
@@ -574,5 +574,53 @@ namespace UniGLTF
             );
             Assert.AreEqual("[version.String] null", ex.Message);
         }
+
+        [Test]
+        public void SameMeshButDifferentMaterialExport()
+        {
+            var go = new GameObject("same_mesh");
+            try
+            {
+                var shader = Shader.Find("Unlit/Color");
+
+                var cubeA = GameObject.CreatePrimitive(PrimitiveType.Cube);
+                {
+                    cubeA.transform.SetParent(go.transform);
+                    var material = new Material(shader);
+                    material.color = Color.red;
+                    cubeA.GetComponent<Renderer>().sharedMaterial = material;
+                }
+
+                {
+                    var cubeB = GameObject.Instantiate(cubeA);
+                    cubeB.transform.SetParent(go.transform);
+                    var material = new Material(shader);
+                    material.color = Color.blue;
+                    cubeB.GetComponent<Renderer>().sharedMaterial = material;
+
+                    Assert.AreEqual(cubeB.GetComponent<MeshFilter>().sharedMesh, cubeA.GetComponent<MeshFilter>().sharedMesh);
+                }
+
+                // export
+                var gltf = new glTF();
+                using (var exporter = new gltfExporter(gltf))
+                {
+                    exporter.Prepare(go);
+                    exporter.Export();
+                }
+
+                Assert.AreEqual(2, gltf.meshes.Count);
+
+                var red = gltf.materials[gltf.meshes[0].primitives[0].material];
+                Assert.AreEqual(new float[] { 1, 0, 0, 1 }, red.pbrMetallicRoughness.baseColorFactor);
+
+                var blue = gltf.materials[gltf.meshes[1].primitives[0].material];
+                Assert.AreEqual(new float[] { 0, 0, 1, 1 }, red.pbrMetallicRoughness.baseColorFactor);
+            }
+            finally
+            {
+                GameObject.DestroyImmediate(go);
+            }
+        }
     }
 }