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I assume it's not instant death when you go back? That should be impossible. But it's possible to rollback to a state where death is still inevitable (depending on how the game was coded) 

Default rollback should give you one turn to rollback. If you need more, then you probably need to type UNDO, to go back a few more turns.

Also (for the author), you can code rollback so that it uses LAST_LOCATION rather than LAST_TURN as the default rollback point.

: lose_game rollback_plan="last_location";

That's a bug with a  older version of Adventuron. It was fixed over two weeks ago. It doesn't affect the gameplay, it just affects when loading from a savestate (doesn't render treasure objects in a list). If you type LOOK, the object will reappear. The object was never missing, just the print doesn't work properly on a rollback (fixed long ago).