Can't figure out how to scan for peripherals supporting specific service

[sarbogast]

Issue

When I scan for all peripherals without specifying a service like the following, I get a certain number of devices that support service 180A (Device Information), as evidenced by the logs printed by discoverServices:

RZBUserInteraction.setEnabled(true)
RZBUserInteraction.setTimeout(5)    
var tags = [Tag]()
central.scanForPeripherals(withServices: nil, options: nil) { (scanInfo, scanError) in
    if let error = scanError {
        if let bluetoothError = RZBluetoothError(rawValue: UInt(error._code)) {
            if bluetoothError == .timeoutError {
                completion(.success(tags))
            } else {
                print("Failed to scan for peripherals because \(String(describing: bluetoothError))")
            }
        } else {
            print("Failed to scan for peripherals because \(String(describing: error))")
        }
    } else if let info = scanInfo {
        let peripheral = info.peripheral
        if(!tags.contains(where: { tag -> Bool in
            tag.uuid == peripheral.identifier.uuidString
        })) {
            tags.append(Tag(
                id: nil,
                uuid: peripheral.identifier.uuidString,
                name: peripheral.name,
                RSSI: info.rssi.intValue
            ))
            peripheral.discoverServiceUUIDs([CBUUID(string: "180A")], completion: { error in
                if let error = error {
                    print("Failed to discover services for \(peripheral.identifier.uuidString) because \(String(describing: error))")
                } else {
                    print("Peripheral \(peripheral.identifier.uuidString) supports 180A")
               }
            })
        }
    }
}

But if I scan specifically for peripherals that advertise that 180A service, I get zero device, as evidenced by the fact that the breakpoint I place on let peripheral = info.peripheral is never triggered.

RZBUserInteraction.setEnabled(true)
RZBUserInteraction.setTimeout(5)
var tags = [Tag]()
central.scanForPeripherals(withServices: [CBUUID(string: "180A")], options: nil) { (scanInfo, scanError) in
    if let error = scanError {
        if let bluetoothError = RZBluetoothError(rawValue: UInt(error._code)) {
            if bluetoothError == .timeoutError {
                completion(.success(tags))
            } else {
                print("Failed to scan for peripherals because \(String(describing: bluetoothError))")
            }
        } else {
            print("Failed to scan for peripherals because \(String(describing: error))")
        }
    } else if let info = scanInfo {
        let peripheral = info.peripheral
        if(!tags.contains(where: { tag -> Bool in
            tag.uuid == peripheral.identifier.uuidString
        })) {
            tags.append(Tag(
                id: nil,
                uuid: peripheral.identifier.uuidString,
                name: peripheral.name,
                RSSI: info.rssi.intValue
            ))
            peripheral.discoverServiceUUIDs([CBUUID(string: "180A")], completion: { error in
                if let error = error {
                    print("Failed to discover services for \(peripheral.identifier.uuidString) because \(String(describing: error))")
                } else {
                    print("Peripheral \(peripheral.identifier.uuidString) supports 180A")
                }
            })
        }
    }
}

Am I forgetting something?