Zabbix 7.0 - added hosts with active checks disabled until proxy restart

[n0tsaved]

Hello,

my company is evaluating zabbix 7.0.1 for it's new feature like proxy HA.
I deployed an installation for testing purpose with:

2 zabbix server (docker container)
1 dedicated mysql for zabbix server
2 zabbix proxy for mysql (docker container)
2 dedicated mysql for each zabbix proxy
1 zabbix ui (docker container)

I added some auto registration actions to enable added hosts and created a proxy group with the 2 proxies.
Then added some hosts via zabbix-agent2

# cat /etc/zabbix/zabbix_agent2.conf
PidFile=/run/zabbix/zabbix_agent2.pid
LogFile=/var/log/zabbix/zabbix_agent2.log
LogFileSize=0
Server=10.15.167.238,10.15.166.135
ServerActive=10.15.167.238;10.15.166.135   <--- proxy ips
Hostname=be01.ads-engagement.stg.ies.it3.ns.farm
HostMetadata=
Include=/etc/zabbix/zabbix_agent2.d/*.conf
ControlSocket=/tmp/agent.sock

At this poin the host is correctly shown in the zabbix dashboard, but the availability colon is greyed out (Active checks: Unknown) and it seems that metrics are not collected from this host.
However when I restart both zabbix-proxies the availability icon turns green and metrics start to be collected

Could this be a tracked bug? or am I missing something?

thanks in advance