https://drive.google.com/file/d/1tiFqp3ugXcalaUa_L2I4QTIS4l2iByk8/view?usp=sharing
The link above is a screen shot of the problem. As the English, I landed Church's Brigade in the Placentia region of Terre Neuve, and assaulted Plaisance. The battle is a stalemate, but all of the French troops are killed. The turn's messages show that the battle was a draw, Church's Brigade destroys Fort de Plaisance, and the survivors flee. On the map, Plaisance is still under French control, but besieged.
I can never occupy Plaisance, or gain credit for capturing the strategic town. I've been able to duplicate this in two games in a row now.
I assume that this is a bug, or am I missing something?