When using a DateTime? for input and a specific format, for example yyyy-MM-dd. If you just want to change the month part and type 03 the focus shifts to the start of the input and the month part gets replaced by MM. Also applies to DateInput.
Reproduce:
https://blazorrepl.telerik.com/QGYFEfPU52ceM2wL03
Select the month part and type 03 for example. If using a non nullable DateTime, this does not happen.
This was marked as a duplicate for this issue: https://feedback.telerik.com/blazor/1468716-datepicker-loses-focus-when-the-input-date-starts-with-0
That issue is now "completed" but the issue I'm describing is not fixed.