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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11303082/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3ad748e6-f5b0-4cb0-9b50-5fb4f45ef38a",
      "cw-888de55e-52ab-49eb-9437-dd7718eab21f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4411409e-25a1-4844-bbd1-62fc5ae64105",
    "manifestId": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11303082/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-888de55e-52ab-49eb-9437-dd7718eab21f",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "canvasIndex": 0,
    "dfgViewerUrl": null,
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb11303082/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": false,
    "view": "single"
  }
}