I was doing Research missions lately for BT and i got an own stack of empty cubes back from each FSM (2 stacks) and those BPs dont stack with normal empty Datacubes and also not with each other, even though theyre all empty datacubes and should be the same xD. They can be reused to research stuff ofc but since they dont stack with shop bought empty Datacubes id guess they have a false flag of some kind. Just a minor bug but maybe u want to look into it.

greetz, ulx