[1.6.6] Chest/d. sack loot restoration

[Preternex]

After reentering zone level some opened chests or digestive sacks become untouched.
This restoration can be repeated multiple times (infinite maybe?) with same containers.
Noticed that before on 1st floor of ruins in Eruan in EoR.
Here's an example found in rhaloren recently. First after return from tower vault (and then every time I enter this level) giant digestive sack can be opened again.

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