It seems that connector data limit is not set with
ZBX_DATA_JSON_RECORD_LIMIT
to 1G.
This can lead to an error like this:
 

2944908:20260123:173927.399 cannot send data to "https://XXXX/etl-zabbix-kafka-api-ticket/zabbix/receive-data ": Response code "413" did not match any of the required status codes "200,201,202,203,204" 

https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/413

While it's probably possible to increase the limits on the other side it would be useful to make a runtime parameter that limits this size.