Combined mesh only updating the seconds time

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1

In my game i have multiple blocks that are combined into one mesh.

When I destroy one of the blocks and call the method to combine the meshes it doesn’t update the first time but when i destroy another block it updates the previous block breaking.

How do I fix it?

combine meshes method:

public void CombineMeshes()
{
    DestroyImmediate(GetComponent<MeshFilter>().mesh, true);
    DestroyImmediate(GetComponent<MeshFilter>().sharedMesh, true);

    MeshFilter[] meshFilters = GetComponentsInChildren<MeshFilter>();
    CombineInstance[] combine = new CombineInstance[meshFilters.Length];
    Material mat = meshFilters[1].GetComponent<Renderer>().material;

    int i = 0;
    while (i < meshFilters.Length)
    {
        combine[i].mesh = meshFilters[i].sharedMesh;
        combine[i].transform = transform.worldToLocalMatrix * meshFilters[i].transform.localToWorldMatrix;
        meshFilters[i].GetComponent<Renderer>().enabled = false;

        i++;
    }

    Mesh mesh = new Mesh();
    mesh.CombineMeshes(combine);
    GetComponent<MeshFilter>().sharedMesh = mesh;
    GetComponent<Renderer>().material = mat;
    GetComponent<Renderer>().enabled = true;
}

destroy block method:

public void demolish()
{
    if (GameObjectsIn.Count > 0)
    {
        foreach (GameObject obj in GameObjectsIn)
        {
            obj.SetActive(true);
            obj.transform.position = new Vector3(transform.position.x, transform.position.y + 0.5f, transform.position.z);
            obj.GetComponentInParent<Rigidbody>().isKinematic = false;
        }
    }

    if (GetComponentInParent<MeshCombiner>())
    {   
        GetComponentInParent<MeshCombiner>().CombineMeshes();
    }

    Destroy(gameObject);
}