preprocessing worker utilization

Hi, sorry for my english (google translate)

Updated zabbix 5.4 => 6.0 and a bug or feature got out
I monitor rabbitmq queues with a standard template's (about 400 queues)
On 5.4 preprocessing loaded 16 workers on 30-40% CPU
On 6.0 preprocessing loads 1 worker at 100% and everything accumulates in a queue
If 2 hosts (cluster + node) then 2 workers 100% each
I tried to use a proxy, the problem remained the same. Proxy loads one worker per host at 100%

OS: Oracle8, kernel 5.4.17-2136.304.4.1.el8uek.x86_64, Database: PostgreSQL + TimescaleDB, official zabbix yum repo