Problem description: in current master release (4.4.0alpha2) Aggregated items become unsupported with error "No items for key '.....' in group(s) '......' " even though items with such keys actually exist for hosts under the corresponding host group. Exactly the same setup works perfectly fine in Zabbix 4.2.6rc1.

Steps to reproduce:

1. Create host group "Hostgroup 1" with several hosts.
2. Create a zabbix agent type item with key "agent.ping" (type of information = numeric (unsigned)) for each host.
3. Create another Host group "Aggregate data" with a signle host.
4. Create an item with type = "Zabbix aggregate", key = grpavg["Hostgroup 1","agent.ping",last], and type of information = Numeric (float).
5. Wait for the items to collect some data.

Result: the status of the "Zabbix aggregate" item is Not supported" with the following error returned in the pop-up: 'No items for key "agent.ping" in group(s) "Hostgroup 1".'

Expected: the Zabbix aggregate item should collect and process data from all items with key "agent.ping" located on all hosts under "Hostgroup 1".

Exported configuration: Aggregated_checks_issue.xml