So I have two issues:

1) Can't redraw the battlefield when exit the DL, needs one additional action. Clicking on System options/return redraws the map, so what could be updated when such action? Is there a way to check and reproduce?

2) I don't know how to reset/recalculate native terrain bonuses. It looks like they are calculated at battle start, depending on terrain, then there is no way to change this.