diff --git a/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menu/index.js b/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menu/index.js
index 5ae860d4bb829..562b18def4fcf 100644
--- a/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menu/index.js
+++ b/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menu/index.js
@@ -22,9 +22,10 @@ import buildNavigationLabel from '../sidebar-navigation-screen-navigation-menus/
 export const postType = `wp_navigation`;
 
 export default function SidebarNavigationScreenNavigationMenu() {
-	const {
-		params: { postId },
-	} = useNavigator();
+	const { params } = useNavigator();
+
+	// See https://github.com/WordPress/gutenberg/pull/52120.
+	const postId = Number( params?.postId );
 
 	const { record: navigationMenu, isResolving } = useEntityRecord(
 		'postType',
diff --git a/packages/edit-site/src/components/sidebar-navigation-screen-page/index.js b/packages/edit-site/src/components/sidebar-navigation-screen-page/index.js
index c5799d97a8064..cd5869cfceb8f 100644
--- a/packages/edit-site/src/components/sidebar-navigation-screen-page/index.js
+++ b/packages/edit-site/src/components/sidebar-navigation-screen-page/index.js
@@ -30,9 +30,9 @@ import SidebarNavigationScreenDetailsFooter from '../sidebar-navigation-screen-d
 export default function SidebarNavigationScreenPage() {
 	const navigator = useNavigator();
 	const { setCanvasMode } = unlock( useDispatch( editSiteStore ) );
-	const {
-		params: { postId },
-	} = useNavigator();
+	const { params } = useNavigator();
+
+	const postId = Number( params?.postId );
 	const { record } = useEntityRecord( 'postType', 'page', postId );
 
 	const { featuredMediaAltText, featuredMediaSourceUrl } = useSelect(
diff --git a/packages/edit-site/src/components/sidebar-navigation-screen-pattern/index.js b/packages/edit-site/src/components/sidebar-navigation-screen-pattern/index.js
index 39f28dba6d520..5815c4818fe9b 100644
--- a/packages/edit-site/src/components/sidebar-navigation-screen-pattern/index.js
+++ b/packages/edit-site/src/components/sidebar-navigation-screen-pattern/index.js
@@ -16,13 +16,16 @@ import useInitEditedEntityFromURL from '../sync-state-with-url/use-init-edited-e
 import usePatternDetails from './use-pattern-details';
 import { store as editSiteStore } from '../../store';
 import { unlock } from '../../lock-unlock';
+import normalizeRecordKey from '../../utils/normalize-record-key';
 
 export default function SidebarNavigationScreenPattern() {
-	const { params } = useNavigator();
 	const { categoryType } = getQueryArgs( window.location.href );
-	const { postType, postId } = params;
 	const { setCanvasMode } = unlock( useDispatch( editSiteStore ) );
 
+	const { params } = useNavigator();
+	const { postType } = params;
+	const postId = normalizeRecordKey( params?.postId );
+
 	useInitEditedEntityFromURL();
 
 	const patternDetails = usePatternDetails( postType, postId );
diff --git a/packages/edit-site/src/components/sidebar-navigation-screen-pattern/use-pattern-details.js b/packages/edit-site/src/components/sidebar-navigation-screen-pattern/use-pattern-details.js
index 9853e2e6de23b..a889e3f6ffcf5 100644
--- a/packages/edit-site/src/components/sidebar-navigation-screen-pattern/use-pattern-details.js
+++ b/packages/edit-site/src/components/sidebar-navigation-screen-pattern/use-pattern-details.js
@@ -19,8 +19,11 @@ import {
 	SidebarNavigationScreenDetailsPanelLabel,
 	SidebarNavigationScreenDetailsPanelValue,
 } from '../sidebar-navigation-screen-details-panel';
+import normalizeRecordKey from '../../utils/normalize-record-key';
 
 export default function usePatternDetails( postType, postId ) {
+	postId = normalizeRecordKey( postId );
+
 	const { getDescription, getTitle, record } = useEditedEntityRecord(
 		postType,
 		postId
diff --git a/packages/edit-site/src/components/sync-state-with-url/use-init-edited-entity-from-url.js b/packages/edit-site/src/components/sync-state-with-url/use-init-edited-entity-from-url.js
index 19518f650c0be..dee20963cfc60 100644
--- a/packages/edit-site/src/components/sync-state-with-url/use-init-edited-entity-from-url.js
+++ b/packages/edit-site/src/components/sync-state-with-url/use-init-edited-entity-from-url.js
@@ -11,11 +11,17 @@ import { privateApis as routerPrivateApis } from '@wordpress/router';
  */
 import { store as editSiteStore } from '../../store';
 import { unlock } from '../../lock-unlock';
+import normalizeRecordKey from '../../utils/normalize-record-key';
 
 const { useLocation } = unlock( routerPrivateApis );
 
 export default function useInitEditedEntityFromURL() {
-	const { params: { postId, postType } = {} } = useLocation();
+	const { params } = useLocation();
+
+	const { postType } = params;
+
+	const postId = normalizeRecordKey( params?.postId );
+
 	const { isRequestingSite, homepageId, url } = useSelect( ( select ) => {
 		const { getSite, getUnstableBase } = select( coreDataStore );
 		const siteData = getSite();
@@ -66,7 +72,7 @@ export default function useInitEditedEntityFromURL() {
 		// In all other cases, we need to set the home page in the site editor view.
 		if ( homepageId ) {
 			setPage( {
-				context: { postType: 'page', postId: homepageId },
+				context: { postType: 'page', postId: Number( homepageId ) },
 			} );
 		} else if ( ! isRequestingSite ) {
 			setPage( {
diff --git a/packages/edit-site/src/components/use-edited-entity-record/index.js b/packages/edit-site/src/components/use-edited-entity-record/index.js
index 22a8bdc32a94a..30d1429ff9247 100644
--- a/packages/edit-site/src/components/use-edited-entity-record/index.js
+++ b/packages/edit-site/src/components/use-edited-entity-record/index.js
@@ -10,6 +10,7 @@ import { decodeEntities } from '@wordpress/html-entities';
  * Internal dependencies
  */
 import { store as editSiteStore } from '../../store';
+import normalizeRecordKey from '../../utils/normalize-record-key';
 
 export default function useEditedEntityRecord( postType, postId ) {
 	const { record, title, description, isLoaded, icon } = useSelect(
@@ -21,7 +22,11 @@ export default function useEditedEntityRecord( postType, postId ) {
 			const { __experimentalGetTemplateInfo: getTemplateInfo } =
 				select( editorStore );
 			const usedPostType = postType ?? getEditedPostType();
-			const usedPostId = postId ?? getEditedPostId();
+
+			let usedPostId = postId ?? getEditedPostId();
+
+			usedPostId = normalizeRecordKey( usedPostId, usedPostType );
+
 			const _record = getEditedEntityRecord(
 				'postType',
 				usedPostType,
diff --git a/packages/edit-site/src/utils/normalize-record-key.js b/packages/edit-site/src/utils/normalize-record-key.js
new file mode 100644
index 0000000000000..48036656c8a64
--- /dev/null
+++ b/packages/edit-site/src/utils/normalize-record-key.js
@@ -0,0 +1,11 @@
+function isNumericID( str ) {
+	return /^\s*\d+\s*$/.test( str );
+}
+
+export default function normalizeRecordKey( postId ) {
+	if ( isNumericID( postId ) ) {
+		postId = Number( postId );
+	}
+
+	return postId;
+}