If you trade with a villager to lock in their profession, and then zombify and cure the villager, they will retain their previous profession and trades but will work at any workstation. ie: A farmer, after being zombified and cured, will stay a farmer but will work at a brewing stand.
A video example can be found here.
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We're tracking this issue in MC-177505, so this ticket is being resolved and linked as a duplicate.
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