diff --git a/docs/reference-guides/data/data-core.md b/docs/reference-guides/data/data-core.md
index a3d6bd5b6f392c..acaaa5f23f1b98 100644
--- a/docs/reference-guides/data/data-core.md
+++ b/docs/reference-guides/data/data-core.md
@@ -413,7 +413,7 @@ _Parameters_
 
 _Returns_
 
--   `UserPatternCategories`: User patterns category array and map keyed by id.
+-   `Array< UserPatternCategory >`: User patterns category array.
 
 ### getUserQueryResults
 
diff --git a/packages/block-editor/src/components/inserter/hooks/use-patterns-state.js b/packages/block-editor/src/components/inserter/hooks/use-patterns-state.js
index 0c938b0474a9fa..aef299f90c1842 100644
--- a/packages/block-editor/src/components/inserter/hooks/use-patterns-state.js
+++ b/packages/block-editor/src/components/inserter/hooks/use-patterns-state.js
@@ -31,8 +31,7 @@ const usePatternsState = ( onInsert, rootClientId ) => {
 			} = getSettings();
 			return {
 				patterns: __experimentalGetAllowedPatterns( rootClientId ),
-				userPatternCategories:
-					__experimentalUserPatternCategories?.patternCategories,
+				userPatternCategories: __experimentalUserPatternCategories,
 				patternCategories: __experimentalBlockPatternCategories,
 			};
 		},
diff --git a/packages/block-editor/src/store/selectors.js b/packages/block-editor/src/store/selectors.js
index c618a354bcd10a..2f73e50b602d2c 100644
--- a/packages/block-editor/src/store/selectors.js
+++ b/packages/block-editor/src/store/selectors.js
@@ -2294,8 +2294,12 @@ const checkAllowListRecursive = ( blocks, allowedBlockTypes ) => {
 function getUserPatterns( state ) {
 	const userPatterns =
 		state?.settings?.__experimentalReusableBlocks ?? EMPTY_ARRAY;
-	const { patternCategoriesMap: categories } =
-		state?.settings?.__experimentalUserPatternCategories ?? {};
+	const userPatternCategories =
+		state?.settings?.__experimentalUserPatternCategories ?? [];
+	const categories = new Map();
+	userPatternCategories.forEach( ( userCategory ) =>
+		categories.set( userCategory.id, userCategory )
+	);
 	return userPatterns.map( ( userPattern ) => {
 		return {
 			name: `core/block/${ userPattern.id }`,
diff --git a/packages/core-data/README.md b/packages/core-data/README.md
index 43ce17f98f8e47..6024f4db2f12d4 100644
--- a/packages/core-data/README.md
+++ b/packages/core-data/README.md
@@ -590,7 +590,7 @@ _Parameters_
 
 _Returns_
 
--   `UserPatternCategories`: User patterns category array and map keyed by id.
+-   `Array< UserPatternCategory >`: User patterns category array.
 
 ### getUserQueryResults
 
diff --git a/packages/core-data/src/selectors.ts b/packages/core-data/src/selectors.ts
index a75e2359261c32..7d6cbeb4daeee9 100644
--- a/packages/core-data/src/selectors.ts
+++ b/packages/core-data/src/selectors.ts
@@ -80,7 +80,7 @@ interface UserState {
 	byId: Record< EntityRecordKey, ET.User< 'edit' > >;
 }
 
-interface UserPatternCategory {
+export interface UserPatternCategory {
 	id: number;
 	name: string;
 	label: string;
@@ -88,11 +88,6 @@ interface UserPatternCategory {
 	description: string;
 }
 
-export interface UserPatternCategories {
-	patternCategories: Array< UserPatternCategory >;
-	patternCategoriesMap: Map< number, UserPatternCategory >;
-}
-
 type Optional< T > = T | undefined;
 
 /**
@@ -1241,21 +1236,13 @@ export function getBlockPatternCategories( state: State ): Array< any > {
  *
  * @param state Data state.
  *
- * @return User patterns category array and map keyed by id.
+ * @return User patterns category array.
  */
 
 export function getUserPatternCategories(
 	state: State
-): UserPatternCategories {
-	const patternCategoriesMap = new Map< number, UserPatternCategory >();
-	state.userPatternCategories?.forEach(
-		( userCategory: UserPatternCategory ) =>
-			patternCategoriesMap.set( userCategory.id, userCategory )
-	);
-	return {
-		patternCategories: state.userPatternCategories,
-		patternCategoriesMap,
-	};
+): Array< UserPatternCategory > {
+	return state.userPatternCategories;
 }
 
 /**
diff --git a/packages/edit-site/src/components/page-patterns/use-patterns.js b/packages/edit-site/src/components/page-patterns/use-patterns.js
index 42455d201a87ca..daaa9dd7822da6 100644
--- a/packages/edit-site/src/components/page-patterns/use-patterns.js
+++ b/packages/edit-site/src/components/page-patterns/use-patterns.js
@@ -170,11 +170,14 @@ const selectUserPatterns = ( select, { search = '', syncStatus } = {} ) => {
 
 	const query = { per_page: -1 };
 	const records = getEntityRecords( 'postType', PATTERN_TYPES.user, query );
-	const categories = getUserPatternCategories();
-
+	const userPatternCategories = getUserPatternCategories();
+	const categories = new Map();
+	userPatternCategories.forEach( ( userCategory ) =>
+		categories.set( userCategory.id, userCategory )
+	);
 	let patterns = records
 		? records.map( ( record ) =>
-				patternBlockToPattern( record, categories.patternCategoriesMap )
+				patternBlockToPattern( record, categories )
 		  )
 		: EMPTY_PATTERN_LIST;
 
@@ -197,7 +200,7 @@ const selectUserPatterns = ( select, { search = '', syncStatus } = {} ) => {
 		hasCategory: () => true,
 	} );
 
-	return { patterns, isResolving, categories: categories.patternCategories };
+	return { patterns, isResolving, categories: userPatternCategories };
 };
 
 export const usePatterns = (
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 ea84610c3de589..fb6be8c7fa2f94 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
@@ -38,10 +38,15 @@ export default function usePatternDetails( postType, postId ) {
 	const { currentTheme, patternCategories } = useSelect( ( select ) => {
 		const { getCurrentTheme, getUserPatternCategories } =
 			select( coreStore );
+		const userPatternCategories = getUserPatternCategories();
+		const categories = new Map();
+		userPatternCategories.forEach( ( userCategory ) =>
+			categories.set( userCategory.id, userCategory )
+		);
 
 		return {
 			currentTheme: getCurrentTheme(),
-			patternCategories: getUserPatternCategories().patternCategoriesMap,
+			patternCategories: categories,
 		};
 	}, [] );