Not working with clone field

I got a bit further, I looked into the problem and found out that the keys (field.data.key) needs to be different.
So I got it this far working that it works in my situation. But when you use multiple flexible content fields I think it won’t work at the moment.

Changed script.js:

if(acf){

    window.acf.addAction( 'ready_field/type=flexible_content', function( field ) {
		
		var fieldKey = '';
		
		if(jQuery('.acf-flexible-content > input').attr('name').includes('_field_')){
			//Clone field
			var fieldKey = jQuery('.acf-flexible-content > input').attr('name').split('[');
			fieldKey = fieldKey[fieldKey.length - 1];
			fieldKey = fieldKey.substring(0, fieldKey.length - 1);
		}
		else{
			//Base field
			fieldKey = field.data.key;
		}
		
		var hidden_layouts = window.acf_hide_layout_options.hidden_layouts[fieldKey];

		// for each layout in the flexible field
		field.$el.find( '.layout' ).each(function( i, element ) {
			var $el = jQuery( element ),
				$controls = $el.find( '.acf-fc-layout-controls' ),
				index = $el.attr( 'data-id' ),
				//name = 'acf[' + field.data.key + '][' + index + '][acf_hide_layout]',
				name = jQuery('.acf-flexible-content > input').attr('name')+'[' + index + '][acf_hide_layout]',
				in_array = -1 !== jQuery.inArray( index, hidden_layouts ),
				is_hidden = in_array && 'acfcloneindex' !== index;

			var $input = jQuery( '<input>', {
				type: 'hidden',
				name: name,
				class: 'acf-hide-layout',
				value: is_hidden ? '1' : '0',
			});

			var $action = jQuery( '<a>', {
				'data-index': index,
				'data-name': 'hide-layout',
				href: '#',
				title: window.acf_hide_layout_options.i18n.hide_layout,
				class: 'acf-icon dashicons acf-hide-layout small light acf-js-tooltip',
			});

			$action.prepend( $input );
			$controls.prepend( $action );

			if ( is_hidden ) {
				$el.addClass( 'acf-layout-hidden' );
			}
		});
	});
	
    jQuery( document ).on( 'click', '.acf-hide-layout', function() {
        var $el = jQuery( this ),
            $layout = $el.parents( '.layout' ),
            $input = $el.find( '.acf-hide-layout' ),
            value = $input.val(),
            newValue = value === '1' ? '0' : '1';

        $input.val(newValue);
        $layout.toggleClass( 'acf-layout-hidden', newValue );
    });
}

See github for completely working code.