Zabbix agent no longer seems to start on Windows as a service, but there is no error in the log (in fact, the log is not even created). The problem seems to be in the following fragment in zabbix_agentd.c:

...
default:
	if (0 != (t->flags & ZBX_TASK_FLAG_MULTIPLE_AGENTS))
	{
		zbx_error("multiple agents option can be used only with Zabbix agent services");
		ret = FAIL;
		goto out;
	}
...

It is likely to be a problem, because when Windows starts our agent as a service, it passes --multiple-agents option without -i, -s, -x, -d, but we expect --multiple-agent to only be used in conjuction with the latter.

This is a regression from ZBXNEXT-611, which added --foreground option.