Discrete layout not summing data inside field

I am working on chart Area → Discrete layout
I have aggregation query for chart as collection names - usageCollection

[
  {
    $project: {
      spendRebate: 1,
      rebateCollected: 1,
      facility: 1
    }
  },
  {
    $facet: {
      rebateCollected: [
        {
          $unwind: {
            path: "$rebateCollected"
            // preserveNullAndEmptyArrays: false,
          }
        },
        {
          $match: {
            "rebateCollected.amount": {
              $exists: true,
              $ne: null
            }
          }
        },
        {
          $project: {
            facility: 1,
            rebateCollectedAmount: "$rebateCollected.amount",
            rebateDate: "$rebateCollected.date"
          }
        },
        {
          $group: {
            _id: {
              facility: "$facility",
              rebateDate: "$rebateDate"
            },
            totalRebatedAmount: {
              $sum: "$rebateCollectedAmount"
            }
          }
        },
        {
          $project: {
            facility: "$_id.facility",
            date: "$_id.rebateDate",
            totalRebatedAmount: "$totalRebatedAmount",
            _id: 0
          }
        }
      ],
      spendRebateData: [
        {
          $unwind: {
            path: "$spendRebate.payPeriod"
          }
        },
        {
          $project: {
            _id: 1,
            facility: 1,
            endDate: "$spendRebate.payPeriod.window.end",
            poAmount: "$spendRebate.payPeriod.spend",
            rebateEarned: "$spendRebate.payPeriod.rebated"
          }
        },
        {
          $group: {
            _id: {
              endDate: "$endDate",
              facility: "$facility"
            },
            totalPOAmount: {
              $sum: "$poAmount"
            },
            totalRebatedEarned: {
              $sum: "$rebateEarned"
            }
          }
        },
        {
          $project: {
            date: "$_id.endDate",
            facility: "$_id.facility",
            totalPOAmount: "$totalPOAmount",
            totalRebatedEarned: "$totalRebatedEarned",
            _id: 0
          }
        }
      ]
    }
  },
  {
    $project: {
      data: {
        $concatArrays: ["$spendRebateData", "$rebateCollected"]
      }
    }
  },
  {
    $unwind: "$data"
  },
  {
    $replaceRoot: {
      newRoot: "$data"
    }
  },
  {
    $group: {
      _id: {
        facility: "$facility",
        date: "$date"
      },
      totalPOAmount: {
        $sum: "$totalPOAmount"
      },
      totalRebatedEarned: {
        $sum: "$totalRebatedEarned"
      },
      totalRebateCollectedAmount: {
        $sum: "$totalRebatedAmount"
      }
    }
  },
  {
    $project: {
      date: "$_id.date",
      facility: "$_id.facility",
      totalPOAmount: 1,
      totalRebatedEarned: 1,
      totalRebateCollectedAmount: 1
    }
  }
]

In the chart I have configuration as
X axis - date
Y axis - totalPOAmount
I added filter on field “facility”
We have two facilities “facilityA” and “facilityB”

Now on chart when facility is not selected , it needs to show data(totalPOAmount) summed up of facilityA and facilityB.
But in actual its showing only single facility data.