diff --git a/lib/experimental/site-editor-permalinks.php b/lib/experimental/site-editor-permalinks.php
index b2cfd978e38e28..d286cbccb64a17 100644
--- a/lib/experimental/site-editor-permalinks.php
+++ b/lib/experimental/site-editor-permalinks.php
@@ -18,11 +18,104 @@ function ( $settings ) {
 	}
 );
 
+function gutenberg_remove_query_args( $args ) {
+	$query_string = $_SERVER['QUERY_STRING'];
+	$query        = wp_parse_args( $query_string );
+	foreach ( $args as $arg_name ) {
+		unset( $query[ $arg_name ] );
+	}
+	return build_query( $query );
+}
+
 function gutenberg_redirect_site_editor_to_design() {
 	global $pagenow;
-	if ( 'site-editor.php' === $pagenow && strpos( $_SERVER['REQUEST_URI'], 'wp-admin/site-editor.php' ) ) {
-		wp_redirect( admin_url( '/design' ), 301 );
+	if ( 'site-editor.php' !== $pagenow || ! strpos( $_SERVER['REQUEST_URI'], 'wp-admin/site-editor.php' ) ) {
+		return;
+	}
+
+	// The following redirects are for the new permalinks in the site editor.
+	if ( isset( $_REQUEST['postType'] ) && 'wp_navigation' === $_REQUEST['postType'] && ! empty( $_REQUEST['postId'] ) ) {
+		wp_redirect( admin_url( '/design/wp_navigation/' . $_REQUEST['postId'] . '?' . gutenberg_remove_query_args( array( 'postType', 'postId' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'wp_navigation' === $_REQUEST['postType'] && empty( $_REQUEST['postId'] ) ) {
+		wp_redirect( admin_url( '/design/navigation?' . gutenberg_remove_query_args( array( 'postType' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['path'] ) && '/wp_global_styles' === $_REQUEST['path'] ) {
+		wp_redirect( admin_url( '/design/styles?' . gutenberg_remove_query_args( array( 'path' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'page' === $_REQUEST['postType'] && ( empty( $_REQUEST['canvas'] ) || empty( $_REQUEST['postId'] ) ) ) {
+		wp_redirect( admin_url( '/design/page?' . gutenberg_remove_query_args( array( 'postType' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'page' === $_REQUEST['postType'] && ! empty( $_REQUEST['postId'] ) ) {
+		wp_redirect( admin_url( '/design/page/' . $_REQUEST['postId'] . '?' . gutenberg_remove_query_args( array( 'postType', 'postId' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'wp_template' === $_REQUEST['postType'] && ( empty( $_REQUEST['canvas'] ) || empty( $_REQUEST['postId'] ) ) ) {
+		wp_redirect( admin_url( '/design/template?' . gutenberg_remove_query_args( array( 'postType' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'wp_template' === $_REQUEST['postType'] && ! empty( $_REQUEST['postId'] ) ) {
+		wp_redirect( admin_url( '/design/wp_template/' . $_REQUEST['postId'] . '?' . gutenberg_remove_query_args( array( 'postType', 'postId' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'wp_block' === $_REQUEST['postType'] && ( empty( $_REQUEST['canvas'] ) || empty( $_REQUEST['postId'] ) ) ) {
+		wp_redirect( admin_url( '/design/pattern?' . gutenberg_remove_query_args( array( 'postType' ) ) ), 301 );
 		exit;
 	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'wp_block' === $_REQUEST['postType'] && ! empty( $_REQUEST['postId'] ) ) {
+		wp_redirect( admin_url( '/design/wp_block/' . $_REQUEST['postId'] . '?' . gutenberg_remove_query_args( array( 'postType', 'postId' ) ) ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'wp_template_part' === $_REQUEST['postType'] && ( empty( $_REQUEST['canvas'] ) || empty( $_REQUEST['postId'] ) ) ) {
+		wp_redirect( admin_url( '/design/pattern?' . $_SERVER['QUERY_STRING'] ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['postType'] ) && 'wp_template_part' === $_REQUEST['postType'] && ! empty( $_REQUEST['postId'] ) ) {
+		wp_redirect( admin_url( '/design/wp_template_part/' . $_REQUEST['postId'] . '?' . gutenberg_remove_query_args( array( 'postType', 'postId' ) ) ), 301 );
+		exit;
+	}
+
+	// The following redirects are for backward compatibility with the old site editor URLs.
+	if ( isset( $_REQUEST['path'] ) && '/wp_template_part/all' === $_REQUEST['path'] ) {
+		wp_redirect( admin_url( '/design/pattern?postType=wp_template_part' ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['path'] ) && '/page' === $_REQUEST['path'] ) {
+		wp_redirect( admin_url( '/design/page' ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['path'] ) && '/wp_template' === $_REQUEST['path'] ) {
+		wp_redirect( admin_url( '/design/template' ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['path'] ) && '/patterns' === $_REQUEST['path'] ) {
+		wp_redirect( admin_url( '/design/pattern' ), 301 );
+		exit;
+	}
+
+	if ( isset( $_REQUEST['path'] ) && '/navigation' === $_REQUEST['path'] ) {
+		wp_redirect( admin_url( '/design/navigation' ), 301 );
+		exit;
+	}
+
+	wp_redirect( admin_url( '/design' ), 301 );
+	exit;
 }
 add_action( 'admin_init', 'gutenberg_redirect_site_editor_to_design' );
diff --git a/packages/edit-site/src/components/editor/index.js b/packages/edit-site/src/components/editor/index.js
index 102c5cd0df9f96..7e3d4ab4fecc46 100644
--- a/packages/edit-site/src/components/editor/index.js
+++ b/packages/edit-site/src/components/editor/index.js
@@ -316,7 +316,9 @@ export default function EditSiteEditor( { isPostsList = false } ) {
 													history.navigate(
 														getNavigationPath(
 															location,
-															postType
+															postWithTemplate
+																? context.postType
+																: postType
 														),
 														{
 															transition:
diff --git a/packages/edit-site/src/components/layout/router.js b/packages/edit-site/src/components/layout/router.js
deleted file mode 100644
index f55ffdaffc04b2..00000000000000
--- a/packages/edit-site/src/components/layout/router.js
+++ /dev/null
@@ -1,61 +0,0 @@
-/**
- * WordPress dependencies
- */
-import { privateApis as routerPrivateApis } from '@wordpress/router';
-import { useEffect } from '@wordpress/element';
-
-/**
- * Internal dependencies
- */
-import { unlock } from '../../lock-unlock';
-import {
-	NAVIGATION_POST_TYPE,
-	PATTERN_TYPES,
-	TEMPLATE_PART_POST_TYPE,
-	TEMPLATE_POST_TYPE,
-} from '../../utils/constants';
-
-const { useLocation, useHistory } = unlock( routerPrivateApis );
-
-export function useRedirectOldPaths() {
-	const history = useHistory();
-	const { params } = useLocation();
-	useEffect( () => {
-		const { postType, path, categoryType, ...rest } = params;
-
-		if ( path === '/wp_template_part/all' ) {
-			history.replace( { postType: TEMPLATE_PART_POST_TYPE } );
-		}
-
-		if ( path === '/page' ) {
-			history.replace( {
-				postType: 'page',
-				...rest,
-			} );
-		}
-
-		if ( path === '/wp_template' ) {
-			history.replace( {
-				postType: TEMPLATE_POST_TYPE,
-				...rest,
-			} );
-		}
-
-		if ( path === '/patterns' ) {
-			history.replace( {
-				postType:
-					categoryType === TEMPLATE_PART_POST_TYPE
-						? TEMPLATE_PART_POST_TYPE
-						: PATTERN_TYPES.user,
-				...rest,
-			} );
-		}
-
-		if ( path === '/navigation' ) {
-			history.replace( {
-				postType: NAVIGATION_POST_TYPE,
-				...rest,
-			} );
-		}
-	}, [ history, params ] );
-}