Sorry for the delay.
The above-reported issue has been fixed and included in the package version 18.4.0.31. Kindly upgrade your package version to the latest one to avail of this fix.
Please find the links below.
NuGet Link: https://www.nuget.org/packages/Syncfusion.Blazor/18.4.0.31
Release notes: https://blazor.syncfusion.com/documentation/release-notes/18.4.31/?type=all#scheduler