Steps to reproduce:

1. Install and start agent 2 on a Windows server with line `HostMetadataItem=system.uname` in the agent configuration file.
2. Create an autoregistration rule with the following:
   Condition: Host metadata contains Windows
   Operation: Link to templates: Windows by Zabbix agent active

Result:
The host will register with the server but all items using performance counters will not collect data. In the agent logs the following message shows up multiple times:

2021/09/23 07:05:23.360574 plugin 'WindowsPerfMon' collector failed: The handle is not a valid PDH object.

Expected:
I was able to get the items to start collecting data by restarting the agents on the hosts. I think the expected behavior should be that the items begin collecting data without requiring a restart of the agent on the monitored machines.