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Meshes disappear

Hi guys,
I have a strange Problem I can't figure out: I'm using the following function to show a preview of the spatial mapping mesh as a miniature to the user. It gets called every 5s while scanning the room.

private void ShowPreview()
        Debug.Log("Update Preview");
        GameObject newRoomPreview = new GameObject("RoomPreview");
        List<MeshFilter> meshFilterList = SpatialMappingManager.Instance.GetMeshFilters();

        foreach (MeshFilter meshFilter in meshFilterList)
            GameObject temp = new GameObject();
            //keep mesh's position and rotation
            temp.transform.position = meshFilter.transform.position;
            temp.transform.rotation = meshFilter.transform.rotation;
            temp.AddComponent<MeshFilter>().sharedMesh = meshFilter.sharedMesh;
            temp.GetComponent<MeshRenderer>().material = new Material(Shader.Find("Standard"));

        newRoomPreview.transform.localScale = new Vector3(0.1f, 0.1f, 0.1f);
        newRoomPreview.transform.localPosition = new Vector3(0f, 0f, 1f);

The strange thing now is, that at the very beginning of every 5s interval, the full updated room mesh gets displayed, but immediatly after that, parts of the mesh begin to disappear (but not everything!). This continues on and on in every interval.
I don't have an idea, why only parts apparently get deleted. Do you have one?

All the best

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