From Wikipedia: Solid CO2 can not be stored in a Storage Compactor and has no further use - so at the current state of game it can not be moved.
It's the problem now.
I can't extract solid CO2 from Conveyor Receptacle as well as solid oxygen.
Steps to Reproduce
When I try to unload my cargo that I get from the Ice Planet.
This issue has not been confirmed by a developer yet.