Incorrect reference validation

[rpash]

In the case of a simple model like below

$version: "2"

namespace my.service

resource Message {
    identifiers: {
        id: String
    }
    properties: {
        message: String
    }
    create: CreateMessage
}

operation CreateMessage {
    output: CreateMessageOutput
}

structure CreateMessageOutput for Message {
    $id
    $message
}

Smithy validators report this warning:

MemberShouldReferenceResource: This member appears to reference the following resources without being included in a `@references` trait: [`my.service#Message`]

We can clearly see that CreateMessageOutput is referencing Message, but the member which the validator is complaining about appears in the identifiers section not the properties section of the resource. It appears the validator does not consider the resource's identifiers in its checks. I would expect this to be completely a valid structure since correct code is generated and the correct type is deduced for CreateMessageOutput.id from this model code. This seems like a false positive and it is extremely clunky to have this code below which references Message twice to get this warning to disappear:

@references([
    {
        // Needed for ID reference
        resource: Message
    }
])
structure CreateMessageOutput for Message {
    $id
    $message
}