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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11129937/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1eee5df4-af26-4d6d-9929-2efefb46ff82",
      "cw-0c5fc380-e5c4-49c7-95fc-7c5c071696b1"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-bf5f9e8a-46f6-46c3-8fb1-217e5c131a39",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11129937/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0c5fc380-e5c4-49c7-95fc-7c5c071696b1",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "canvasIndex": 0,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11129937/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": false,
    "view": "single"
  }
}