Hello Michael,
Thank you for your report. I confirm this is an issue with the present version of the Kendo UI Spreadsheet. In addition, I have updated your Telerik points for gratitude for bringing the problem to our attention.
I have logged this issue for fixing, and you can track its progress in GitHub:
https://github.com/telerik/kendo-ui-core/issues/1746
Apologies for the inconvenience this might caused you.
Let me know if you need additional assistance.
Regards,
Stefan
Telerik
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