While it's not really a bug, it should be an implementation detail and right now it's just confusing:

1 C
  2

Given 1 is a casing with a downwards facing module, C is a controller and 2 is a casing with a right facing module, right now the two modules can't communicate, because usually that communication would be handled by the casing in the corner (where the controller sits). This will need special handling to have them communicate directly instead. Doing that would also reduce the delay introduced by such a setup, though, which I guess is a good thing anyway.