Steps to reproduce:

1. install 7.2.6
2. request  zabbix[preprocessing]
   https://www.zabbix.com/documentation/7.0/en/manual/discovery/low_level_discovery

   While the "data" element has been removed from all native items related to discovery, for backward compatibility Zabbix will still accept the JSON notation with a "data" element, though its use is discouraged.

Result:

Expected:

{
        "queued": {
                "count": 0,
                "size": 0
        },
        "direct": {
                "count": 0,
                "size": 0
        },
        "queue": 0
}