From journalctl: 
jan 22 12:52:01 percona-master-dev-68183 zabbix_agent2[10887]: [mysql] 2021/01/22 12:52:01 packets.go:36: unexpected EOF
jan 22 12:52:01 percona-master-dev-68183 systemd[1]: mysql.service: Main process exited, code=exited, status=2/INVALIDARGUMENT