Google Gantt Chart only display the last event

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Hello everyone, I am trying to make a Gantt Chart to display my data. I am using the Google Gantt Chart plugin from the market place. But only the last data of my list is displayed,  I have seen people with the same issue on this forum as well as on other forum but no answer.  I figured maybe someone found a fix by now. Thanks ftaking the time to read my issue.
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