Value of Switches in iOS 12 always returned as 0

Description

When I need to get the value of XCUIElementTypeSwitch it always returns 0. Appium UI Explorer shows the correct value of the switches, but the value is incorrect during automated tests. Occurs on iOS 12, doesn't occur on iOS 13.

Environment

• Java client 7.3.0
• Appium server version: 1.15.0 / 1.16.0-beta1
• Desktop OS/version: macOS 10.14.6
• Node.js version: 10.17.0 / 12.13.0
• Mobile platform/version under test: iOS 12.1.4
• Real device or emulator/simulator: real device - iPhone 8

Code To Reproduce Issue [ Good To Have ]

public void bluetoothOff() throws Exception {
    driver.runAppInBackground(Duration.ofSeconds(-1));
    driver.activateApp("com.apple.Preferences");
    driver.terminateApp("com.apple.Preferences");
    driver.activateApp("com.apple.Preferences");
    driver.findElement(By.id("Bluetooth")).click();

    WebElement BLE = driver.findElement(MobileBy.iOSClassChain("**/XCUIElementTypeSwitch[`name==\"Bluetooth\"`]"));
    String BluetoothState = BLE.getAttribute("value");
        if (BluetoothState.equals("1")) {
            BLE.click();
        } else {
            System.out.println("Bluetooth already disabled");
        }
        driver.launchApp();
}

Exception Stacktraces

No exception, just returns 0 every time.

Start with the provided bluetoothOff() reproduction and compare BLE.getAttribute("value") on iOS 12.1.4 and iOS 13, using the listed Appium and Java client versions. Done means an XCUIElementTypeSwitch returns its actual state instead of always returning 0 on iOS 12.