SwiftUI - Xcode 11 Dev Beta 1: TabbedView Doesn't Refresh or Display When Switching Tabs

I'm having an issue playing around with the TabbedView that doesn't seem to load the content when I switch between tabs in the Simulator.
If I have the app start on Tab 1, using something like:

TabbedView(selection: .constant(1))

...the content within the view of the first tab displays perfectly. But after clicking on Tab 2 manually, the content in Tab 2's view doesn't display. However, if I have the app start with Tab 2, the content in Tab 2 displays fine...but the content of Tab 1 doesn't display when I click on it. It's almost as if it isn't refreshing the view in a TabbedView situation as I attempt to switch between them, but each loads properly when it is designated as the TabbedView's starting position only.
If I don't designate starting position, the app defaults to Tab 1 as the starting point and the issue remains the same as if I had designated the starting point manually.
With SwiftUI being so new, I'm probably just missing something very simple...

Any ideas? Thanks everyone!

Dump of "ContentView.Swift"

import SwiftUI

struct ContentView : View {

    var body: some View {
        TabbedView {
            SettingsView()
                .tabItemLabel(Text("Settings"))
        
            HistoryView()
                .tabItemLabel(Text("History"))
        }

Dump of "SettingsView.swift"

import SwiftUI

struct SettingsView : View {
    var body: some View {
        Text("Settings View, First Tab Location")
    }
}

Dump of "HistoryView.swift"

import SwiftUI

struct HistoryView : View {
    var body: some View {
        Text("History View, 2nd Lab Location")
    }
}