As you can see in the screenshots, the delivery destination is Damnclown's Funland in Sigma Hydri to be delivered to L 12-40 Blue Power Corporation, this faction does not exist in this system, making this mission un-completable.
Ok, just submitted a bug report, will do a support ticket for good measure, thanks for your help.
Really? Good to know, I submitted it as a technical issue, I'll make another one as "lost my stuff" if they don't reply to that one in 3 days. I work customer service myself and multiple, simultaneous tickets usually just get closed as duplicates.
@sinisalo Yes, the polymers are in the cargo, I read that these missions used to be different, but I started relatively recently, so I've always had to pick up the cargo after accepting the mission.