i know that this bug also affected java, but its in bedock now, a village will spawn and there would only be 1 villager, making it impossible to breed more, and making tading a lot more difficult. it really ruins the game. heres the java bug report: MC-175239
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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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I believe you are just experiencing random world generation. I don't think MC-175239 is related because that was an issue in just one Java snapshot. If you can reproduce villages having only one villager, please provide the seeds and coordinates.