Light Shafts through window mesh

Hey there I have a cube as a window with a glass material applied but when I use Light Shafts they don’t show through the window (as you can see in the screenshot the Light Shafts are only appearing through a crack in the roof area). What do I need to do to the window models to have the Light Shafts appear through the windows? Thanks in advance.

Should my windows just be a single plane or a box or it doesn’t matter?

Because it seems when I change them from a box to a plane the light shafts filter through.

Looks like I had to use a plane model in the end.