Hi Mantas,
Thanks for contacting Syncfusion support.
We checked the attached sample and in the attached sample when we add new record we able to get the record details in the insertURL. For your convenience we have attached the screenshot and please refer the below screenshot for more reference,
The mentioned issue will reproduced when we did not provide the value for the some of the fields. We checked your request and found that the some fields have null values. To resolve the issue at your end, we suggest you to define the field as optional.
Homecontroller.cs
public long? OrderID { get; set; }
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Regards,
Rajapandi R