Steps to reproduce:

1. Deploy Server, Frontend, Proxy (I tried 7.0.0beta2, didn't try older versions yet)
2. Add Proxy to zabbix through frontend (Active mode)
3. Deploy a zabbix agent on a certain host (Linux in my case)
4. Add the host in zabbix frontend (agent interface, monitored by the proxy)

Result:
{}Interface never comes up for the host, only after restarting the proxy.
When adding the host directly to be monitored with the proxy, it works fine, and comes up instantly.

Expected:
Interface becomes available within after a short period of time.