diff --git a/packages/core-commands/src/admin-navigation-commands.js b/packages/core-commands/src/admin-navigation-commands.js
index a72b0c7dd5ab9b..2a189c1c7404dd 100644
--- a/packages/core-commands/src/admin-navigation-commands.js
+++ b/packages/core-commands/src/admin-navigation-commands.js
@@ -3,9 +3,40 @@
  */
 import { useCommand } from '@wordpress/commands';
 import { __ } from '@wordpress/i18n';
-import { external, plus } from '@wordpress/icons';
+import { external, plus, symbol } from '@wordpress/icons';
+import { useSelect } from '@wordpress/data';
+import { store as coreStore } from '@wordpress/core-data';
+import { addQueryArgs, getPath } from '@wordpress/url';
+import { privateApis as routerPrivateApis } from '@wordpress/router';
+
+/**
+ * Internal dependencies
+ */
+import { unlock } from './lock-unlock';
+
+const { useHistory } = unlock( routerPrivateApis );
 
 export function useAdminNavigationCommands() {
+	const history = useHistory();
+
+	const { isBlockTheme, canAccessSiteEditor } = useSelect( ( select ) => {
+		return {
+			isBlockTheme:
+				// To avoid making core-commands dependent on block-editor using store string literal name.
+				// eslint-disable-next-line @wordpress/data-no-store-string-literals
+				select( 'core/block-editor' )?.getSettings()
+					.__unstableIsBlockBasedTheme,
+			canAccessSiteEditor: select( coreStore ).canUser(
+				'read',
+				'templates'
+			),
+		};
+	}, [] );
+
+	const isSiteEditor = getPath( window.location.href )?.includes(
+		'site-editor.php'
+	);
+
 	useCommand( {
 		name: 'core/add-new-post',
 		label: __( 'Add new post' ),
@@ -24,10 +55,26 @@ export function useAdminNavigationCommands() {
 	} );
 	useCommand( {
 		name: 'core/manage-reusable-blocks',
-		label: __( 'Manage all of my patterns' ),
-		callback: () => {
-			document.location.href = 'edit.php?post_type=wp_block';
+		label: __( 'Open patterns' ),
+		callback: ( { close } ) => {
+			if (
+				( ! isSiteEditor && ! isBlockTheme ) ||
+				! canAccessSiteEditor
+			) {
+				document.location.href = 'edit.php?post_type=wp_block';
+			} else {
+				const args = {
+					path: '/patterns',
+				};
+				const targetUrl = addQueryArgs( 'site-editor.php', args );
+				if ( isSiteEditor ) {
+					history.push( args );
+				} else {
+					document.location = targetUrl;
+				}
+				close();
+			}
 		},
-		icon: external,
+		icon: isSiteEditor ? symbol : external,
 	} );
 }
diff --git a/packages/core-commands/src/site-editor-navigation-commands.js b/packages/core-commands/src/site-editor-navigation-commands.js
index 3d551619d63b04..fe562b6e441396 100644
--- a/packages/core-commands/src/site-editor-navigation-commands.js
+++ b/packages/core-commands/src/site-editor-navigation-commands.js
@@ -13,7 +13,6 @@ import {
 	symbolFilled,
 	styles,
 	navigation,
-	symbol,
 } from '@wordpress/icons';
 import { privateApis as routerPrivateApis } from '@wordpress/router';
 import { getQueryArg, addQueryArgs, getPath } from '@wordpress/url';
@@ -198,23 +197,6 @@ function useSiteEditorBasicNavigationCommands() {
 			},
 		} );
 
-		result.push( {
-			name: 'core/edit-site/open-template-parts',
-			label: __( 'Open patterns' ),
-			icon: symbol,
-			callback: ( { close } ) => {
-				const args = {
-					path: '/patterns',
-				};
-				const targetUrl = addQueryArgs( 'site-editor.php', args );
-				if ( isSiteEditor ) {
-					history.push( args );
-				} else {
-					document.location = targetUrl;
-				}
-				close();
-			},
-		} );
 		return result;
 	}, [ history, isSiteEditor ] );