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1) Acquire cargo boxes
2) Put them in a cargo hold, but not on a cargo grid (I tested it in a vulture)

What happened
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Some of the boxes will start shaking/jittering wildly. The happened while the ship remained at rest.

What should have happened
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Boxes not on a cargo grid should exhibit the same effects of gravity and laws of inertia until acted upon.

Workaround
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no