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Ticket Id: https://support.syncfusion.com/agent/tickets/490067
In a partial select scenario, when clicking the header checkbox, all the checkboxes are expected to be selected. By default, the checkbox field works such that all checkboxes are selected when the header checkbox is clicked. However, when a field name is specified in the checkbox field, in a partial selection scenario, clicking the header checkbox deselects all the currently selected checkboxes.
Documentation: https://ej2.syncfusion.com/angular/documentation/treegrid/selection/check-box-selection