Steps to reproduce:

After upgrading the client to 6.0.46 we started getting these errors:

1. maj 05 09:35:43 new systemd[1]: Starting zabbix-agent2.service - Zabbix Agent 2...
   maj 05 09:35:43 new zabbix_agent2[85231]: failed to parse flags: flag provided but not defined: -T
   maj 05 09:35:43 new zabbix_agent2[85231]: Usage of Zabbix agent 2:
   maj 05 09:35:43 new zabbix_agent2[85231]:   zabbix_agent2 [-c config-file]
   maj 05 09:35:43 new zabbix_agent2[85231]:   zabbix_agent2 [-c config-file] [-v] -p
   maj 05 09:35:43 new zabbix_agent2[85231]:   zabbix_agent2 [-c config-file] [-v] -t item-key
   maj 05 09:35:43 new zabbix_agent2[85231]:   zabbix_agent2 [-c config-file] -R runtime-option
   maj 05 09:35:43 new zabbix_agent2[85231]:   zabbix_agent2 -h
   maj 05 09:35:43 new zabbix_agent2[85231]:   zabbix_agent2 -V
   maj 05 09:35:43 new systemd[1]: zabbix-agent2.service: Control process exited, code=exited, status=1/FAILURE
   maj 05 09:35:43 new systemd[1]: zabbix-agent2.service: Failed with result 'exit-code'.
   maj 05 09:35:43 new systemd[1]: Failed to start zabbix-agent2.service - Zabbix Agent 2.

Its caused by the ExecStartPre containing the  -T 

[Unit]
Description=Zabbix Agent 2
After=syslog.target
After=network.target
[Service]
Environment="CONFFILE=/etc/zabbix/zabbix_agent2.conf"
EnvironmentFile=-/etc/default/zabbix-agent2
Type=simple
Restart=on-failure
PIDFile=/run/zabbix/zabbix_agent2.pid
KillMode=control-group
ExecStartPre=/usr/sbin/zabbix_agent2 -T -c $CONFFILE
ExecStart=/usr/sbin/zabbix_agent2 -c $CONFFILE
ExecStop=/bin/sh -c '[ -n "$1" ] && kill -s TERM "$1"' -- "$MAINPID"
RestartSec=10s
User=zabbix
Group=zabbix
LimitNOFILE=8192
[Install]
WantedBy=multi-user.target

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Result:
See screenshot...
See log file...
See memory dump...
Expected:
See screenshot....
See attached patch file...