Problem with missing messages in GELF over HTTP by fluentbit


I am having this strange issue with Graylog.
I am using fluentbit configured to send docker logs to graylog.
Input as forward, output as http gelf.
when i use nc -l to listen what is sent it, looks OK. All messages are sent.

In graylog there were messages only in 5 seconds difference.
When i change
Flush 5

to 1 second, messages started to appear in 1 second difference. So I have one message per second, even there is sent a lot of them.

How can I solve this problem?
It looks as if messages are sent in “chunks” but only first message is processed/stored.

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