Gelf plugin use incorrect @timestamp

[os11k]

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I have Gelf plugin which gets uncompressed data from Freeswitch and then uploads it to kafka. Timestamp field what arrives to Kafka is not correct it is always 2 or 3 minutes before or after event. I would like to add that when I use docker for sending logs in same way and docker use compressed data, there is no such issue.

I'm usingx docker image of Logstash 7.4.2.

I have pretty simple config:

input {
    gelf {
        type => gelf
        port => 12201
    }
}

output {
        stdout {}
        kafka {
                bootstrap_servers => "aaaa.com:9092"
                security_protocol => "SASL_SSL"
                sasl_mechanism => "PLAIN"
                jaas_path => "/usr/share/logstash/config/jaas.conf"
                request_timeout_ms => "20000"
                topic_id =>  "logs"
                ssl_truststore_type => "PKCS12"
                ssl_truststore_location => "/usr/share/logstash/config/aaa.p12"
                ssl_truststore_password => "password"
                codec => "json"
        }
}

Strange part that if I check docker logs then I can't find that messages affected by timestamp, but I see all else, even so I have stdout {} what should duplicate everything to docker logs.

[os11k]

Issue seems in freeswitch, sorry for noise