There is a bug in the MVVM scenario for this event that is logged in the following page: https://github.com/telerik/kendo-ui-core/issues/4740. You can monitor its progress by clicking the Subscribe button. I have also raised the issue's priority because of your report.
I am sorry to say that I cannot offer a workaround for this. The only option I can think of is using the change event in case this fits your needs.
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