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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/LeoP3po/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua377490/Lorzm4m",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-5861a09f-4d07-4cb5-8a28-a3246ed18151",
      "cw-42e6e8d3-008a-4981-ada3-a1563ffbf5aa"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "LeoP3po",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/LeoP3po/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-42e6e8d3-008a-4981-ada3-a1563ffbf5aa",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}