I didn't know that about the valid for placement setting. Does this mean I misunderstood what I was seeing? Can more than one civil cell be valid for placement within a given file?
Also, as a request, can I suggest a new button to re-validify(?) the civil cell so that we don't have to follow all the same steps to re-create it?
Edit: For what it's worth, I found that I can have multiple civil cells within a single file. Just have to make sure, as Nico Roman mentioned, that the cell is valid for placement.