Mocked return value is different for different cases

[shurale85]

Hi!
Not really sure if this is an issue. I guess I miss smth internal of swiftymoky.
I have protocol:

// this is from object
public protocol MailAddressProtocol: AutoMockable {
    var mailbox: String? { get }
    var displayName: String? { get }
}

public extension MailAddressProtocol {
    var title: String? {
        guard let displayName = self.displayName else {
            return mailbox
        }
        
        return displayName
    }
}

• I set property title of mock object from, so it returns string "test title"
• I set property fromof mock object header, so it returns object from
• And I expect that from.title equals to header.from!.title.

let from = MailAddressProtocolMock()
from.given(.title(getter: "Test title"))
header.given(.from(getter: from))
var t = from.title // test title
var h = header.from!.title // nil

However, my expectation is failed. from.title returns "test title" and header.from!.title returns nil

When I call from.title it returns given value and when I call header.from!.title it returns value from title of extension MailAddressProtocol.
I can't understand why does the same object from have different behavior.