Top scoping a class in a query returns empty

[dmcnaught]

Eg

Works: $output = query_nodes("bitnet_environment_id="${::bitnet_environment_id}" and Class[bitnet_rabbitmq]", ipaddress)

Doesn't work (empty string): $output = query_nodes("bitnet_environment_id="${::bitnet_environment_id}" and Class[::bitnet_rabbitmq]", ipaddress)