Steps to reproduce:

1. NTP template (https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/ntp_service/template_app_ntp_service.yaml)

Result:
Still using key: 'net.tcp.service[ntp]'
Expected:
Expected to use key: 'net.udp.service[ntp]'

In some point in the past, this was fixed as reported here:

https://www.zabbix.com/documentation/3.0/en/manual/installation/template_changes?hl=NTP

However currently still pointing to use tcp.