Lockscreen notification bug in IOS13

After updating to 13, I have been noticing that notification on the lockscreen stays for some more time after it is cleared. Initially, I thought it's double notification or clearing notification not working, but actually after some time or after locking and then waking up the screen it goes away. I don't know whether visually also the notification remains there for some time, or it is VoiceOVER misreporting.