I still have a few stored utility buildings (power, water, etc) from the Services update. I've been using them in Design, assuming they would be returned to me.
But have I been assuming wrong? I used a stored fusion plant, and it's gone now!
Just because you have it in your storage does not mean you can use it in DC and have it returned. Only buildings that you can store normally will be returned.
As a general rule - if you can buy it in the main menu, it's not storable. So Fusion Power, Salt Water Plant, any of the regular Fire/ Police / Health etc are not storable and should not be used in DC.
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