Hi Pradeep,
We would like to inform you that, after you have released the key keydown event will trigger. During the backspace press without release then the filtering will not happen. It is the default behavior.
Please check this scenario, if still issue persists could you please provide more details to proceed further.
1. Issue reproducing sample
2. Code snippet
3. If possible replicate the issue in our given sample
Regards,
Sureshkumar P