If any swimming mob find a one block deep hole no matter how wide on the bottom of the lake, they will swim there and then stop moving, clumping together with other mobs that swim and just not moving
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Could not reproduce, can you upload an example world? Maybe there is a set of flowing water sources on the said bottom, and they get stuck on that.