diff --git a/src/wp-admin/menu.php b/src/wp-admin/menu.php
index 75e3d7e065303..17317f9daa24b 100644
--- a/src/wp-admin/menu.php
+++ b/src/wp-admin/menu.php
@@ -210,7 +210,7 @@
 	$submenu['themes.php'][6] = array(
 		__( 'Template Parts' ),
 		'edit_theme_options',
-		'site-editor.php?postType=wp_template_part&path=/wp_template_part/all',
+		'site-editor.php?path=/wp_template_part/all',
 	);
 }
 
diff --git a/src/wp-admin/site-editor.php b/src/wp-admin/site-editor.php
index 6c4efd2a50c2b..93b1a9313135f 100644
--- a/src/wp-admin/site-editor.php
+++ b/src/wp-admin/site-editor.php
@@ -23,7 +23,10 @@
 	wp_die( __( 'The theme you are currently using is not compatible with the Site Editor.' ) );
 }
 
-$is_template_part_editor = isset( $_GET['postType'] ) && 'wp_template_part' === sanitize_key( $_GET['postType'] );
+$is_template_part = isset( $_GET['postType'] ) && 'wp_template_part' === sanitize_key( $_GET['postType'] );
+$is_template_part_path = isset( $_GET['path'] ) && 'wp_template_partall' === sanitize_key( $_GET['path'] );
+$is_template_part_editor = $is_template_part || $is_template_part_path;
+
 if ( ! wp_is_block_theme() && ! $is_template_part_editor ) {
 	wp_die( __( 'The theme you are currently using is not compatible with the Site Editor.' ) );
 }