Index: src/wp-admin/css/customize-nav-menus.css
===================================================================
--- src/wp-admin/css/customize-nav-menus.css	(revision 33413)
+++ src/wp-admin/css/customize-nav-menus.css	(working copy)
@@ -214,10 +214,8 @@
 	width: 30px;
 	height: 38px;
 	margin-right: 0 !important;
-	text-indent: 100%;
 	outline: none;
 	overflow: hidden;
-	white-space: nowrap;
 	cursor: pointer;
 }
 
@@ -227,38 +225,28 @@
 	box-shadow: 0 0 0 1px #5b9dd9, 0 0 2px 1px rgba(30, 140, 190, .8);
 }
 
-/* Duplicates `.nav-menus-php .item-edit:before {}` in common.css:2220. */
-.wp-customizer .menu-item .item-edit:before {
-	top: -1px;
-	right: 0;
+/* rework the arrow indicator implementation for NVDA bug same as #32715 */
+.wp-customizer .menu-item .item-edit .toggle-indicator {
+	display: inline-block;
+	font-size: 20px;
+	line-height: 1;
+}
+
+.wp-customizer .menu-item .item-edit .toggle-indicator:after {
 	content: '\f140';
-	border: none;
-	background: none;
 	font: normal 20px/1 dashicons;
+	color: #a0a5aa;
+	vertical-align: top;
 	speak: none;
-	display: block;
-	padding: 0;
-	text-indent: 0;
-	text-align: center;
-	position: relative;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	text-decoration: none !important;
 }
 
-.wp-customizer .menu-item.menu-item-edit-active .item-edit:before {
+.wp-customizer .menu-item.menu-item-edit-active .item-edit .toggle-indicator:after {
 	content: '\f142';
 }
 
-.wp-customizer .menu-item .item-edit:before {
-	line-height: 2;
-}
-
-/* Duplicates `.nav-menus-php .menu-item-edit-active .item-edit:before {}` in common.css:2271. */
-.wp-customizer .menu-item .menu-item-edit-active .item-edit:before {
-	content: '\f142';
-}
-
 .wp-customizer .menu-item-settings p.description {
 	font-style: normal;
 }
Index: src/wp-admin/js/customize-nav-menus.js
===================================================================
--- src/wp-admin/js/customize-nav-menus.js	(revision 33413)
+++ src/wp-admin/js/customize-nav-menus.js	(working copy)
@@ -1364,6 +1364,7 @@
 					self.container.trigger( 'expanded' );
 				};
 
+				$menuitem.find( '.item-edit' ).attr( 'aria-expanded', 'true' );
 				$inside.slideDown( 'fast', complete );
 
 				self.container.trigger( 'expand' );
@@ -1377,6 +1378,7 @@
 
 				self.container.trigger( 'collapse' );
 
+				$menuitem.find( '.item-edit' ).attr( 'aria-expanded', 'false' );
 				$inside.slideUp( 'fast', complete );
 			}
 		},
Index: src/wp-includes/class-wp-customize-control.php
===================================================================
--- src/wp-includes/class-wp-customize-control.php	(revision 33413)
+++ src/wp-includes/class-wp-customize-control.php	(working copy)
@@ -1685,10 +1685,10 @@
 					<span class="menu-item-title<# if ( ! data.title ) { #> no-title<# } #>">{{ data.title || wp.customize.Menus.data.l10n.untitled }}</span>
 				</span>
 				<span class="item-controls">
-					<button type="button" class="not-a-button item-edit"><span class="screen-reader-text"><?php
+					<button type="button" class="not-a-button item-edit" aria-expanded="false"><span class="screen-reader-text"><?php
 						/* translators: 1: Title of a menu item, 2: Type of a menu item */
 						printf( __( 'Edit menu item: %1$s (%2$s)' ), '{{ data.title || wp.customize.Menus.data.l10n.untitled }}', '{{ data.item_type_label }}' );
-					?></span></button>
+					?></span><span class="toggle-indicator" aria-hidden="true"></span></button>
 					<button type="button" class="not-a-button item-delete submitdelete deletion"><span class="screen-reader-text"><?php
 						/* translators: 1: Title of a menu item, 2: Type of a menu item */
 						printf( __( 'Remove Menu Item: %1$s (%2$s)' ), '{{ data.title || wp.customize.Menus.data.l10n.untitled }}', '{{ data.item_type_label }}' );