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TypeError: Failed to fetch

{
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    "error": "TypeError: Failed to fetch",
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    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://antenati.cultura.gov.it/ark:/12657/an_ua15353220/wREOEn3",
    "collectionIndex": 0,
    "companionAreaOpen": true,
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    "id": "window-251d7da1-439b-4783-8ca6-a12489832192",
    "manifestId": "https://dam-antenati.cultura.gov.it/antenati/containers/La7n74D/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
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    "imageToolsOpen": true,
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