Notification Bundle containing an error state

{
  "resourceType" : "Bundle",
  "id" : "e2c9dc20-615e-4603-9005-74deb209cbb0",
  "type" : "subscription-notification",
  "timestamp" : "2020-04-17T10:24:13.1882432-05:00",
  "entry" : [{
    "fullUrl" : "urn:uuid:b21e4fae-ce73-45cb-8e37-1e203362b2ae",
    "resource" : {
      "resourceType" : "SubscriptionStatus",
      "id" : "b21e4fae-ce73-45cb-8e37-1e203362b2ae",
      "text" : {
        "status" : "generated",
        "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative: SubscriptionStatus</b><a name=\"b21e4fae-ce73-45cb-8e37-1e203362b2ae\"> </a></p><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Resource SubscriptionStatus &quot;b21e4fae-ce73-45cb-8e37-1e203362b2ae&quot; </p></div><p><b>status</b>: error</p><p><b>type</b>: event-notification</p><p><b>eventsSinceSubscriptionStart</b>: 328</p><h3>NotificationEvents</h3><table class=\"grid\"><tr><td>-</td><td><b>EventNumber</b></td><td><b>Timestamp</b></td></tr><tr><td>*</td><td>328</td><td>18 Apr 2020, 1:20:00 am</td></tr></table><p><b>subscription</b>: <a href=\"broken-link.html\">http://example.org/FHIR/R5/Subscription/123</a></p><p><b>topic</b>: <a href=\"http://example.org/FHIR/R5/SubscriptionTopic/admission\">http://example.org/FHIR/R5/SubscriptionTopic/admission</a></p><p><b>error</b>: No response <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/4.0.0/CodeSystem-subscription-error.html\">Subscription Error Codes</a>#no-response)</span></p></div>"
      },
      "status" : "error",
      "type" : "event-notification",
      "eventsSinceSubscriptionStart" : "328",
      "notificationEvent" : [{
        "eventNumber" : "328",
        "timestamp" : "2020-04-17T10:20:00.0000000-05:00"
      }],
      "subscription" : {
        "reference" : "http://example.org/FHIR/R5/Subscription/123"
      },
      "topic" : "http://example.org/FHIR/R5/SubscriptionTopic/admission",
      "error" : [{
        "coding" : [{
          "system" : "http://terminology.hl7.org/CodeSystem/subscription-error",
          "code" : "no-response"
        }]
      }]
    }
  }]
}