Bathroom rooflight design- new?

Thanks to a broken locking catch we have just had to have AS replace the bathroom rooflight on our 2014 Broadway EK.  Apart from being cleaner a brief look shows no differences. 

Yesterday however I looked at it more closely than before and, I think it is different to the original. In both the window bit is made of concentric circles of moulded plastic. The original was, I feel sure, a solid sheet of plastic. The new one has, on the internal parts of the concentric circles, no plastic at all and you can poke your fingers through to the outside air. 

Good for ventilation - if wanted in winter- and, despite some horrendous rainstorms and very wet travelling conditions we have not had any internal flooding, though I can’ t see why the water hasn’t been channelled in.

Can anyone confirm my observations about the new and old designs or did I not look at the old one closely enough ?

Thanks Cymro. You’re right ! My OH, whose finger is longer than mine, has just poked it through the open slots and hit the sparkly clean outer cover that I failed to reach or see.

Whew ! Glad it is there : even though we have had no rain in I couldn’t see how my picture of it could keep rain out so was worrying.

Shows how dirty the broken one was however...