logrt possibly read old log file from very beginning after log rotation if new log and old log has same timestamp

How to reproduce:

• Add item: logrt[/tmp/^testlog.*$]
• Write some text to the log file: echo `date` >> /tmp/testlog
• Zabbix agent read log file and send contents to Zabbix server
• Write text and rotate log file: echo `date` >> /tmp/testlog; mv /tmp/testlog /tmp/testlog.1; touch /tmp/testlog /tmp/testlog.1
• Zabbix agent check log files, but doesn't send last added line
• Write text to new testlog: echo `date` >> /tmp/testlog
• Zabbix agent read from very beginning of testlog.1

The procedure above is simulation of logrotate, but this problem happened with logrotated.