HOLES_Not showing all the way through grouped objects

I have brought onto the work plane a cube, then placed a hole in the cube and grouped them. Hole is higher than the cube and goes through the wprkplane.

The hole is cut out of the cube and I can see all the way through,

I bring in another cube and place it on top of the first cube and group all three shapes, cube 1, hole and cub3.

Now the hole only shows through one of the cubes but not through both cubes, and all three shapes are grouped together.