Query result for campaign bid strategy missing data

[rpj]

Ads API version 9

When I query for campaign bid strategy data it is missing the 
maximize_conversion_value.target_roas value. Can someone tell me why?

I successfully create a test campaign like this:

{
  "operations": [
    {
      "create": {
        "name": "testBST_Campaign1",
        "status": "paused",
        "maximizeConversionValue": {
          "targetRoas": 0.05
        },
        "advertisingChannelType": "SEARCH",
        "networkSettings": {
          "targetGoogleSearch": true,
          "targetSearchNetwork": true,
          "targetContentNetwork": false,
          "targetPartnerSearchNetwork": false
        },
        "geoTargetTypeSetting": {
          "positiveGeoTargetType": "PRESENCE_OR_INTEREST",
          "negativeGeoTargetType": "PRESENCE_OR_INTEREST"
        },
        "targetingSetting": {
          "targetRestrictions": [
            {
              "targetingDimension": "AUDIENCE",
              "bidOnly": true
            }
          ]
        },
        "campaignBudget": "customers/xxxxxxxxxx/campaignBudgets/10027594965"
      }
    }
  ]
}

But then when I try to pull back the *maximize_conversion_value.target_roas* 
using this GAQL:

*SELECT campaign.bidding_strategy, campaign.bidding_strategy_type, 
bidding_strategy.maximize_conversion_value.target_roas, 
bidding_strategy.type FROM campaign...*

I get this, notice, no field value for 
*maximize_conversion_value.target_roas* :

{
  "campaignBudget": {
    "amountMicros": "500000000",
    "resourceName": "customers/xxxxxxx/campaignBudgets/10027594965"
  },
  "campaign": {
    "networkSettings": {
      "targetGoogleSearch": true,
      "targetPartnerSearchNetwork": false,
      "targetContentNetwork": false,
      "targetSearchNetwork": true
    },
    "servingStatus": "SERVING",
    "endDate": "2037-12-30",
    "advertisingChannelType": "SEARCH",
    "name": "testBST_Campaign1",
    "targetingSetting": {
      "targetRestrictions": [
        {
          "targetingDimension": "AUDIENCE",
          "bidOnly": true
        }
      ]
    },
    "resourceName": "customers/xxxxxx/campaigns/15522814930",
    "id": "zzzzzzzzzzzzzz",
    "biddingStrategyType": "MAXIMIZE_CONVERSION_VALUE",
    "adServingOptimizationStatus": "OPTIMIZE",
    "startDate": "2021-12-10",
    "status": "PAUSED"
  }
}

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