ABAshokkumar Balasubramanian Syncfusion Team October 10, 2019 08:16 AM
Good day to you.
We were able to replicate your reported problem in Dropdown List component. We have confirmed this as bug at our end. We will fix and include the solution on our October last weekly patch release, which is expected to be rolled out on Oct 29,2019. Please be patience until then.
You can track the status of this problem by using below feedback portal.
SPSureshkumar P Syncfusion Team November 1, 2019 03:48 AM
Thanks for the patience.
We are glad to announce that our latest release in the version 17.3.21 has been rolled out successfully and in that release, we have included the “"Filtering not working properly in dropdownlist component when pressing the backspace key rapidly”.So, we suggest you upgrade our Syncfusion packages to our latest version to resolve this issue in your end.
Please find the release notes details from the below link.
SPSureshkumar P Syncfusion Team November 5, 2019 01:16 AM
We have checked the reported issue at our end and as we promised earlier, this issue has been fixed in the latest package version 17.3.21. We suspect that the older package version may be referred in your application. So, we suggest you check and ensure the packages are referred correctly in your application to get rid of the issue.
So, we have prepared the sample and video demonstration attached below.