Bootstrap 4 toggle button not working Sage 9.3, BS 4.0.0-beta.2

Hi, does anyone know why my toggle button is not working (not showing any items on click) in Sage 9.3? I am using Bootstrap 4.0.0-beta.2 and everything else works fine, the normal desktop mode is fine, but switching to tablet or 320px view and the toggle button, whilst there, doesn’t show any items? package.json below,

“dependencies”: {
“bootstrap”: “v4.0.0-beta.2”,
“font-awesome”: “^4.7.0”,
“jquery”: “1.12.4 - 3”,
“popper.js”: “1.12.3”,
“tether”: “^1.4.3”


{{ get_bloginfo('name', 'display') }}
	 @if (has_nav_menu('primary_navigation'))
	 {!! wp_nav_menu(['theme_location' => 'primary_navigation', 'walker' => new wp_bootstrap_navwalker(), 'menu_class' => 'navbar-nav nav pull-right']) !!}

I’m wondering if perhaps I should have a different jQuery version although I have now tried 1.9.1 and 3.2.1?

Many Thanks