Lost logs with logrotate

I have a logstash process that writes a log file ( syslog.log) and a logstash process that reads the log file.
When logrotate starts, it changes the filename into syslog-[date].log and some logs that aren't read yet from second logstash process are lost . The conf file of second logstash process is like this

    type => "syslog"
    codec => "json"
    path => "/var/log/syslog.log"
    start_position => "beginning"
    sincedb_path => "/var/log/logstash/sincedb/.sincedb_syslog"

I tried to increase batch and workers of second logstash process but I lost anyway logs.
Any suggest?

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