Recalculate bounds of Skinned Mesh

I have a skinned mesh and I'd like to be able to recalculate its bounds after modifying its blendshape weight.
Here's my method:

public IEnumerator ResizeMesh(int value)
    var skinnedMesh = GetComponent<SkinnedMeshRenderer>();
    var m = skinnedMesh.sharedMesh;
    skinnedMesh.SetBlendShapeWeight(1, value);
    yield return new WaitForEndOfFrame();
    skinnedMesh.sharedMesh = m;

The mesh is resized correctly when setting the blendshape but the bounds of the mesh stay the same.
What am I missing?

Hi,I guess: The skinnedMesh.sharedMesh can't be BakeMesh(), Because it is a Shared Mesh, maybe you can use follow code:
var m = new Mesh(); Or var m = Object.Instantiate(skinnedMesh.sharedMesh);