[1.09u] BUG: When one unit is killed in combat, inconsistently locks out ability to continue fighting
First scenario: take a hero and a regular unit into battle. If one of them is killed, SOMETIMES the other unit is unselectable/can't continue the battle. You have to choose 'auto-resolve' to get out of the battle.
Since I rarely lose even one unit in battle, it's harder to reproduce, but it happens about 1/10 of the time (guess).