When building at 50x long rods from a core, any block that takes an orientation that can be mirrored (EG, Tetras show this behaviour best) when passing through into a new Chunk will change their orientation.
Build Mode XZ Plane (second one) mirror must be activated, Or, use the other two mirror planes when building vertically above the ship core.
Not sure how to classify the bug, so Ill leave that to the team.
After placing one set, any new 50m built off the core on that side will show normal behaviour. Placing another 50 line on the end of the starting line will give the same effect as well