Hi Omar,
Thanks for contacting Syncfusion Support.
We have checked your reported issue. We can reproduce your reported issue in our end. We can resolve your issue by using SUM formula as like in the below code snippet.
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spreadsheet.updateCell({ formula: "=SUM(E2:E3)" }, "H3");
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For your reference we have prepared sample:
However, we will consider this as a defect, and it will be available on our next patch release. We appreciate your patience until then
Regards,
Aravinthan S