Hi Chaouki,
Thank you for your update.
We were able to reproduce the mentioned issue.We suspect this could be a defect.We have forwarded this issue to our development team for further analysis.
Could you please report this issue through Direct Trac Developer Support System
https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents because you can take the advantage of the expertise of a dedicated support engineer and a guaranteed response time and we hope you will take advantage of this system as well. If you have already reported through Direct trac, please ignore this.
Please let me know if you have any queries.
Regards,
Poornima