Well I would bet on the strictly 2d, bank stabilized navigation too. Depth reader can be bank independent but then you have to steer up/down and you must know which direction it is.
I guess the stabilization must be active because torpedo can spin too easily with no extending planes and only little room for low-center-of-gravity based stabilization. And if it had low center of gravity it would bank into turn as sub does and then it would have little means to stabilize again.
As for propulsion, most types are gravity independent, and negative G would happen .. but some types can handle the negative G only for short amount of time. Also I guess some orientation would be important during storage, because of batteries, fuel tanks and so on.
So at the moment I think it is stabilized because it can help the navigation and some types of propulsion. The stabilization is done actively by steering planes based on some sensors (probably 3d gyros reset at launch). Center of gravity would be intentionally neutral (exactly in the axis) so torpedo does not bank in turns.
It would also mean there is some 'this side up' label on the torpedo.
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