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I have put together a series of steps that shows an example of what happens here, but I have done it several times now and the results varies.
Sometimes the HQ takes on the north facing right away other times after a save.
Also on one occasion I got the HQ facing north after a load without giving any bombard orders at all to its attached subordinates, so it would seem that it is indeed the save that is causing the facing to change for the HQ...sometimes.
Its definitely the bombard order, with an open box that is causing the bombard capable units to face north though.
It all seems very higgledy pickaldy, but if I was to recommend somewhere to start looking for the smoking gun (good pun there), it would be with the bombard order.
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