I am not fully sure I understand the mechanism completely.
Did province ownership change because of this? What options, if any other than war, does Turkey have to reclaim its provinces in this example?
Turkey should still be owner of this provinces but Yugoslavia is their controller. This means demanding territory and diplomatic trade of provinces doesn't work.
But if Turkish troops enter this provinces they switch back immediately - so demanding military access to Yugoslavian territory ist propably the only peaceful way of getting these provinces back.