PodAntiAffinity support

Is PodAntiAffinity supported when using TaskRuns?

I'm attempting to ensure that specific jobs do not get scheduled together on the same node, to do this, I attempted to use a podTemplate section with the following:

{
 // ... rest of spec
  "podTemplate": {
    "affinity": {
      "podAntiAffinity": {
        "requiredDuringSchedulingIgnoredDuringExecution": [
          {
            "labelSelector": {
              "matchExpressions": [
                {
                  "key": "jobName",
                  "operator": "In",
                  "values": [
                    "maintenance"
                  ]
                }
              ]
            },
            "topologyKey": "kubernetes.io/hostname"
          }
        ]
      }
    }
  }
}

However, when the task run is created the pod for the job does no longer contain the affinity rules.