Civic centers of allies can even be placed into the starting mines.
The correct way to implement a stronghold base can be found in the very first map that implemented the pattern: Island Stronghold (prior to the introduction of rmgen2 stronghold placement code that shows the reported bug).
It computes the angle of each resource so that the resources are never placed in between players or in the same place as civic centers.
It would be great to avoid further duplication of the starting base code, so maybe retry loops for resources after the civic centers were placed and marking the area between the 4 civic center points as unplaceable would equally solve the issue without hardcoding things.
