We have a work in progress local fix for this issue. This fix is not ready for primetime, but I did run your savegame through the fix.
I should note the combat the save was made in has been finished through Auto Combat in a newer build than is available on any one we have shipped currently, but you can continue the session from here if it works well and the conclusion of said battle is not unsatisfactory.
We cannot give a timeframe on the proper fix just yet. Stay tuned.