Index: src/wp-admin/menu.php
===================================================================
--- src/wp-admin/menu.php	(revision 35588)
+++ src/wp-admin/menu.php	(working copy)
@@ -86,6 +86,7 @@
 	$ptype_menu_position = is_int( $ptype_obj->menu_position ) ? $ptype_obj->menu_position : ++$_wp_last_object_menu; // If we're to use $_wp_last_object_menu, increment it first.
 	$ptype_for_id = sanitize_html_class( $ptype );
 
+	$menu_icon = $ptype_obj->hierarchical ? 'dashicons-admin-page' : 'dashicons-admin-post';
 	if ( is_string( $ptype_obj->menu_icon ) ) {
 		// Special handling for data:image/svg+xml and Dashicons.
 		if ( 0 === strpos( $ptype_obj->menu_icon, 'data:image/svg+xml;base64,' ) || 0 === strpos( $ptype_obj->menu_icon, 'dashicons-' ) ) {