Hmm, I tried it out and you are correct.
Akula II:
First test: 10kts, 150m. Rose to 18m, no overshoot.
Second Test: 4kts, 150m. Set depth for 18m, but the ship continued to rise, causing the sail and the TA Pod to broach. It finally stopped at about 14m before sinking back down to 18m.
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