const lastUpdatedEngines = 
  _.map(
    _.filter(
      _.groupBy(actualData, 'engine'), // Group each engine
      status => _.size(status) > 1 // Look for arrays having more than one entry
    ),
    engines => {
      const lastUpdatedEngine = engines.reduce((a, b) =>
        new Date(a?.updatedAt) > new Date(b?.updatedAt) ? a : b // compare the updatedAt for each engine and pick the latest
      )
      return lastUpdatedEngine
    }
  )

const uniqueUpdatedEngines = _.unionBy(lastUpdatedEngines, actualData, 'engine')