Hi Yu,
Thanks for using Syncfusion products.
We need to confirm that the reported issue will be resolved in later versions and we need to check the feasibility to merge the fix the lower versions. So we request you to create your customer account under Direct Trac and open a new incident with the reproducing sample, so that our support engineer will assist you accordingly.
Our Direct Trac support system can be accessed from the following link:
https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents
Regards,
Sumathi J