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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/La8K4PW/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua526955/wj7BOKv",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-186bb4d6-3c4a-4fcc-af87-a4309b739a37",
      "cw-7907c7af-2955-4da1-bc50-3f9c3fefd7eb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "La8K4PW",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/La8K4PW/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7907c7af-2955-4da1-bc50-3f9c3fefd7eb",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}