That one time was special: the author of the map "Jedi story" wrote that one location can only be passed using autobattle: the hero simply walks on water, and neutral creatures stand in his way; without autobattle, the game simply "crashes" in this location, because, according to the game's logic, a battle always takes place either on some kind of terrain or on the deck of a ship, but there is water, and the hero doesn't swim, but walks on the water.
If anyone has more accurate information about autobattle or can provide a link to it, I would be grateful.
And I completely agree with your opinion about the "stupid hero AI" and your distrust of it.
(Василь Симоненко. Люди – прекрасні)