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If you control enemy land and start hiring mercenaries, then leave the province, and it gets returned to the opponents control due to an ajacent fort, the merc will still finish hiring...
That sounds more like a bug to me, unless I hear a reason why it's working as designed. I guess because once you put down the gold, a mercenary group is already pledged to be fighting for you and their deployment time is more about breaking camp than scrounging men together? I have no idea.