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1) take a fabricator into a ship big enough that has cargo grid and none cargo grid space
2) place fab on none cargo grid space
3) the fab grid wont work and Items falls
4) the moment put the fabricator back on cargo grid
5) the fab grid works and takes items in

What happened
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Fabricator Grid is not working and accepting item if the Fab itself is not on a cargo grid

What should have happened
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it should accept items whether its on cargo grid or not , fab tray should carry its own cargo grid without requiring to be attached to another cargo grid

Workaround
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no