Setting environment variable in DeploymentConfig to status.podIP only works intermittently

Issue

When setting an environment variable inside DeploymentConfig to equal the status.podIP (like below), sometimes the environment variable is not set after deployment:

# oc get dc test -o yaml | grep -A 6 containers
      containers:
      - env:
        - name: TEST_APP_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP