Thank you for the project and the sample file. I was able to reproduce the observed issue. I have approved this bug report and updated you Telerik points.
I am afraid I cannot suggest a workaround for this issue.
I want to apologize for the inconvenience this issue is causing you. Thank you for your understanding.
Regards,
Dimitar
Progress Telerik
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.