SwiftUI's `WebPage` back navigation not working as expected

I'm currently testing SwiftUI's WebKit by building a browsing application.

For the back navigation, I have the following code implemented:

if let item = webPage.backForwardList.backList.last {
    webPage.load(item)
    print(
        """
        =====
        backForwardList.backList:
        \(webPage.backForwardList.backList)
        ---
        backForwardList.currentItem:
        \(webPage.backForwardList.currentItem)
        ---
        backForwardList.forwardList:
        \(webPage.backForwardList.forwardList)
        =====
        """.trimmingCharacters(in: .whitespacesAndNewlines)
    )
}

When I look at the logs, it shows that whenever I navigate back, the currentItem is updated with the item, but the backList is appended with the previous currentItem, and the forwardList is always empty.

Am I implementing this incorrectly?

Thanks in advance!