Game breaking bug - can no longer save after exchanging the rover container with the tipper. Diagnosis as follows: In freeplay, can create a new save and also save over a previous save.
Go to Rover, swap the Container for the Tipper on the big crusher. Drive back to the Hangar. Cannot save either a new save or over an old save. Exit game. Restart game, load last save, go to Rover, Leave the container on the trailer, drive around base and back to the hangar. Can save both new and over old saves. Drive rover to the crusher and swap container for tipper. Still cannot save either a new save or over an old save. Drive rover to crusher, print a new tipper and swap the new tipper for old. Still cannot save. Auto save after sleep does not happen.
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