How to resize a single tile from a tilemap?

I am having trouble with re-scaling a tile.

 public void OnTriggerEnter2D(Collider2D col)  {
         var tileMatrix = tilemap.GetTransformMatrix(tilePosition);
         print("tileMatrix");
         print(tileMatrix);
         var scaleMatrix = tileMatrix * Matrix4x4.Scale(new Vector3(0.1f,0.1f,1f));
         print("scaleMatrix");
         print(scaleMatrix);
         tilemap.SetTransformMatrix(tilePosition, scaleMatrix);
         tilemap.RefreshAllTiles();
         var tileMatrix2 = tilemap.GetTransformMatrix(tilePosition);
         print("tileMatrix2");
         print(tileMatrix2);
     }

When I print scaleMatrix I get the scaled matrix correctly, but then I apply it and print the transform matrix from the tile again but the value I get is the same as it was before. Any idea why this is hapenning?