The Cali is outside year round, as I suppose many many are, including at dealers, the general dirt that has worked in below the top edge of the seal is what looks green, not in fact green but brown ( first photo shows it better) as would be expected when general muck works its way into an enclosed space. ( similar to behind the rear light clusters etc, or anywhere that cannot be directly cleaned during a normal cleaning and polishing regime.
I wouldn’t expect a weather seal to fail this prematurely, regardless, after all its a proprietary weather seal on a vehicle.
I posted to highlight the potential with a relatively new seal and highlight the early failure so others may be aware, not to wait, and take appropriate action to prevent the ferrous part of the seal making contact with the painted aluminium, which is the known cause of the bi- metallic issues with the roof so many have experienced.
There is no sign of the dreaded rot, but I have no doubt if left to it’s own devises the seal would cause an issue with the roof in time, resulting in a long repair wait and a time without the van.