dotted expression with expressive lookup don't get expanded

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      {$lookup:{ from:'x',
                       let: { a : "$$ROOT"},
                       pipeline: [ {$addFields:{a:"$$a.field"}} ]
      ...
      }}
      

      Referencing "$$a.field" returns full object "$$a" instead of just field 'field'

              Assignee:
              James Wahlin
              Reporter:
              Asya Kamsky
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                Created:
                Updated:
                Resolved: