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1) Enter reclaimer salvage processing deck and start creating CM/RMC cargo containers.
2) Place container in cargo grid
3) Try to move already placed container from within grid to another location

What happened
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Target container with tractor tool, container got green outline. Press LMB, tractor tool fires up, green outline disappears.
Cannot move already snapped cargo container a second time.

What should have happened
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Cargo boxes shall not snap to grid permanently without the possibility to moved them around again.

Workaround
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No. Instead try to place cargo containers wisely in advance.