Because of the new core update onlining these structures the cargo deposit hanger doesn’t work on any of these structures until a core is installed. This feature was created to help stop these bait contracts that people would just remove docking rights after you accept it and cause you to fail it that way. However there is nothing in any of the notes about this feature “the cargo deposit hanger” not working and seems to be a mistake as to it now would allow these contracts to begin again. I see tether, modules, armor and shields, but nothing about this cargo deposit hanger so it would seem to me it would work as intended. But it doesn’t.
So, drop a structure and don’t put a core in and let the bait contracts begin again, I guess.