[Koha] patron notice

I am using Koha 17.05.07 in debian 8 and Koha & mails are working fine in this instance. I upgrade it to new Koha 20.05.07 in debian 10, and suddenly circulation mails get stopped. Overdues mails are working fine but check-in, check-out mails are not working. When I checked there is no entry in message_queue table for circulation. I don't know what is the issue. Any point of help is highly appreciated.