The KendoReact MaskedTextBox value cannot be cleared once a value is set. See this forum post for examples and a proposed workaround: https://www.telerik.com/forums/maskedtextbox-cannot-be-cleared

I would like for a user to be able to clear the MaskedTextBox value without having to code it as a special case in the onChange event handler. I believe this should be done by default as per the Kendo jQuery MaskedTextBox, but it could also be optional via a prop or clear button.