My metal refinery has 45 tons of steam stored inside of it.
Steps to Reproduce
I wasn't paying attention to it for a while, at some point I think the output pipe broke and I deconstructed it and at some point I deactivated the building. Came back to it after a while, deconstructed it to reconfigure that part of the base, the whole base fills up with steam so I reload and see what happened and found that it had 45 tons of steam inside of it.
This issue has not been confirmed by a developer yet.