It's not a bug I like, while the escorts drive you down, the convoy could get away. The escorts stopping to listen is fine, and would work regardless of what the convoy does.
Also, the IJN used active pinging a lot. To their detriment, even, since escorts would frequently lead the convoy pinging the whole way, and US subs would hear the pinging and head the right way without even having to see smoke or masts.
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