Version 4.4.4 Missing sender_url value in API call /api/v4/messages/

Version 4.4.4:
In api call http://drs.xxxxxx.com:8000/api/v4/messages/ the message result has null in sender_url

{
      "body": "Document version \" LU0322252924 - Xtrackers FTSE Vietnam Swap UCITS ETF 1C - KID.pdf (March 3, 2023, 6:59 p.m.)\" has been exported and is available for download using the link: /storage/downloads/1124/download/ or from the downloads area (/storage/downloads/).",
      "date_time": "2023-03-04T19:50:59.762494+01:00",
      "id": 1114,
      "read": false,
      "sender_app_label": "storage",
      "sender_model_name": "downloadfile",
      "sender_object_id": 1124,
      "sender_url": null,
      "subject": "Document version exported.",
      "url": "http://drs.xxxxxx.com:8000/api/v4/messages/1114/"
    },

the value for “sender_url” is null

instead in version 4.3.x using the same API call the result is:

{
      "body": "Document version \" LU0322252924 - Xtrackers FTSE Vietnam Swap UCITS ETF 1C - KID.pdf (March 3, 2023, 6:59 p.m.)\" has been exported and is available for download using the link: /storage/downloads/1123/download/ or from the downloads area (/storage/downloads/).",
      "date_time": "2023-03-04T19:48:23.298110+01:00",
      "id": 1113,
      "read": false,
      "sender_app_label": "storage",
      "sender_model_name": "downloadfile",
      "sender_object_id": 1123,
      "sender_url": "http://mayan.xxxxxx.com:8000/api/v4/documents/22508/versions/5443/",**
      "subject": "Document version exported.",
      "url": "http://mayan.xxxxxx.com:8000/api/v4/messages/1113/"
    },

the value for sender_url is present http://mayan.xxxxxx.com:8000/api/v4/documents/22508/versions/5443/

in my case that’s happen after exporting a document version

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