Front Window Seal.

Whilst away I opened the front windows to give the van a clean between the adjacent panes and noticed a  cut-out in the window rubbers,one either side.

At first I thought they were to do with the window locks but they are nowhere near them.

They look to be crudely cut out as opposed to machine cut and I wondered what they were for.

They aren't causing any problem at all,no leaks or anything but someone must have cut them for a reason.

Any ideas ?

Ian