When I run a cruiser through a line of enemy ships, only one broadside fires, at the assigned target. If the assigned target is on the port side, and there are other ships on the starboard side, the guns are silent on that side.
This was unrelated, the bug that was addressed was making big caliber side guns to be considered "secondaries" in manual fire control, something reported multiple times in previous patches.
The guns will still be grouped in a separate fire control system and will not fire on both sides independently (like old cannon ships).
We will try to offer a feature to make secondary guns fire control deeper, but we cannot promise anything, since we focus on campaign and crew for next patches.