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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam-antenati.cultura.gov.it/antenati/containers/LooNa67/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua15313774/5KyJ697",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-94dd1db2-3ede-4f93-b406-42c500472149",
      "cw-c1402b2c-8b3b-4da1-ab8c-e6f0abe60555"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8f5e70fb-27bc-4017-9a0f-c772c002ea6f",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/LooNa67/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c1402b2c-8b3b-4da1-ab8c-e6f0abe60555",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "visibleCanvases": []
  }
}