Set animation clip humanoid

Hi,

I am creating an asset bundle on the fly by importing assets from a given folder. One of the assets is an fbx file, which contains an animation clip. I need to set the IsHumanMotion flag to try, so I use the AnimationUtility.SetAnimationType function to do this. All works great! I try to save using EditorApplication.SaveAssets etc. But when I reload the asset, it tells me IsHumanMotion = false. What am I doing wrong. Here's a code snippet:

 // If this is an fbx asset, do the following
 if (lowerfn.Contains(".fbx"))
                 {
                     // SET HUMAN ON FBX AND COMMIT!
                     var importer = (ModelImporter)ModelImporter.GetAtPath(localPath); // e.g "Assets/Body.fbx"
                     importer.animationType = ModelImporterAnimationType.Human;
                     EditorUtility.SetDirty(importer);
                     EditorApplication.SaveAssets(); // this does save the change to the fbx itself, but I need it commited on the clip.
                 Log("Set model to humanoid via the model importer and saved");

                 // Load the asset.
                 Object[] tObjects = AssetDatabase.LoadAllAssetsAtPath(localPath);

                 // Animation clip object to be searched for in the fbx file.
                 Object animClip = null;
                 
                 // Search the objects within the fbx file for the clip (named the same name as the bundle id).
                 foreach (var item in tObjects)
                 {
                     Log("Searching for clip - this object name = " + item.name);

                     // We know the animation clip has the same name as the bundle id.  So pick it out using that match.
                     if (item.name == bundleid)
                     {
                         Log("Found animation clip! Setting to humanoid");
                         animClip = item;

                         // Set the clip to humanoid.
                         AnimationUtility.SetAnimationType((UnityEngine.AnimationClip)animClip, ModelImporterAnimationType.Human);
                         Log("Clip set to humanoid: " + ((UnityEngine.AnimationClip)animClip).isHumanMotion);

                         
                         EditorUtility.SetDirty(animClip);
                         EditorApplication.SaveAssets();                            
                         AssetDatabase.SaveAssets();
                         AssetDatabase.Refresh();

 // At this point, if I reloaded the asset and got the clip, is human motion would be false again!
                         // Stop the for loop.
                         break;
                     }
                 }

                 // Set T = to animation clip, so it is then added to the list.
                 if (animClip != null)
                     t = animClip;
             }
             else
             {
                 // Load the asset.
                 Object tObjects = Resources.LoadAssetAtPath(localPath, typeof(T));

                 if (tObjects != null)
                     t = tObjects;
             }

Thanks for help in advance!!