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I'm sorry but I can't help you. Because I haven't set the exploration flag!!! I suppose that Steam has messed up again. Like removing the private tag on its own and so on.
I know they are not fit for the exploration mode, and they were never meant to be.
But really there is nothing I can do. Sorry
Thanks!
Maybe you should watch this video . Volgraza had made a quite good guide how to attach the modules to each other