Column used in MappedProjection and directly doesn't return correct data

[nafg]

Haven't reliably reproduced but basically given

def myProjection =
  (
    (a, b).mappedTo[Thing],
    a
  )

and used in a query, the second a seems unreliable. It seems some sort of internal optimization reuses some array encoding where type mappers overwrite each other, IIRC from last time I hit this.