Hi Ma,
Greetings from Syncfusion.
We have already fixed the reported issue. Please find the Custom NuGet in the version 17.2.0.34 from the below link.
Disclaimer:
Please note that we have created this custom NuGet for version 17.2.0.34, specifically to resolve the following issue reported in this forum 146545.
Please crosscheck at your end by clearing the NuGet cache as mentioned in this link before installing the provided NuGet. The fix for this issue will be included in our upcoming weekly NuGet which is available on Aug 13th, 2019. Appreciate your patience until then.
Also, please confirm us whether the issue resolved using the above NuGet.
Regards,
Rachel.