data uplifting fails for certain event data,

Given the event below the uplifting returns an empty graph. Which should not be the case....

{
    "derived": {
        "@context": "http://schema.org",
        "@graph": []
    },
    "metadata": {
        "created_at": "2024-05-14T06:40:57.867061",
        "data_harvesting_version": "1.1.0",
        "last_modified_at": "2024-05-15T07:30:03.058065",
        "uuid": "3a3ead35-72e1-422f-92b6-c394018477ac"
    },
    "original": {
        "@context": "http://schema.org",
        "@id": "https://events.hifis.net/event/1271/",
        "@type": "Event",
        "description": "After the successful lunch-to-lunch meeting in Heidelberg (22.11-23.11.2023), we are happy to invite you to the lunch-to-lunch meeting in Braunschweig (13-14.05.2024).\u00a0The goal is to enable to meet in-person and to discuss cross-topic issues. The agenda is intended as a guide and may be amended to best serve the purpose of the lunch-to-lunch meeting.\u00a0Please register here: https://events.hifis.net/event/1271/manage/registration/1341/registrations/We are looking forward to seeing you there.\u00a0Mattea, Stephanie and Cordula\u00a0",
        "endDate": "2024-05-14T13:25:00+02:00",
        "location": {
            "@type": "Place",
            "address": "Helmholtz Centre for Infection Research, Inhoffenstra\u00dfe 7, 38124 Braunschweig",
            "name": "Braunschweig, HZI (Science Campus, St\u00f6ckheim)"
        },
        "name": "NFDI4Microbiota Lunch-to-Lunch Meeting",
        "startDate": "2024-05-13T11:30:00+02:00",
        "url": "https://events.hifis.net/event/1271/"
    },
    "patch_stack": []
}