Steps to reproduce:

1. Use zabbix 7 proxy HA feature
2. Have 2 proxy within same proxy group
3. Set up some hosts with latest zabbix-agent2
4. Configure agent "ServerActive" with the aforementioned proxies
5. restart agent

Result:
New hosts are showing in the dashboard but active checks are not working (greyed out)

Restarting proxies seem to solve the issue
Expected:
New hosts are showing in the dashboard and active checks are working

Tested on 7.0.1 and 7.0.2.

Please let me know if you need additional info