diff --git a/src/Umbraco.Web.UI.Client/src/core/mocks/domains/dictionary.handlers.ts b/src/Umbraco.Web.UI.Client/src/core/mocks/domains/dictionary.handlers.ts
index ba47b8ec0b..77a3a72942 100644
--- a/src/Umbraco.Web.UI.Client/src/core/mocks/domains/dictionary.handlers.ts
+++ b/src/Umbraco.Web.UI.Client/src/core/mocks/domains/dictionary.handlers.ts
@@ -92,7 +92,7 @@ export const handlers = [
 			},
 		];
 
-		const value = umbDictionaryData.save([data])[0];
+		const value = umbDictionaryData.save(data);
 
 		const createdResult = {
 			value,
@@ -110,7 +110,7 @@ export const handlers = [
 		if (!key) return;
 
 		const dataToSave = JSON.parse(data[0].value);
-		const saved = umbDictionaryData.save([dataToSave]);
+		const saved = umbDictionaryData.save(dataToSave);
 
 		return res(ctx.status(200), ctx.json(saved));
 	}),
@@ -182,7 +182,7 @@ export const handlers = [
 		if (!file) return;
 
 		importResponse.parentKey = req.url.searchParams.get('parentId') ?? null;
-		umbDictionaryData.save([importResponse]);
+		umbDictionaryData.save(importResponse);
 
 		// build the path to the new item => reflects the expected server response
 		const path = ['-1'];
diff --git a/src/Umbraco.Web.UI.Client/src/core/mocks/domains/document-type.handlers.ts b/src/Umbraco.Web.UI.Client/src/core/mocks/domains/document-type.handlers.ts
index 02fd203f22..2a35512574 100644
--- a/src/Umbraco.Web.UI.Client/src/core/mocks/domains/document-type.handlers.ts
+++ b/src/Umbraco.Web.UI.Client/src/core/mocks/domains/document-type.handlers.ts
@@ -4,7 +4,7 @@ import type { DocumentTypeResponseModel } from '@umbraco-cms/backend-api';
 
 // TODO: add schema
 export const handlers = [
-	rest.post<DocumentTypeResponseModel[]>('/umbraco/management/api/v1/document-type/:key', (req, res, ctx) => {
+	rest.post<DocumentTypeResponseModel>('/umbraco/management/api/v1/document-type/:key', (req, res, ctx) => {
 		const data = req.body;
 		if (!data) return;
 
@@ -22,7 +22,7 @@ export const handlers = [
 		return res(ctx.status(200), ctx.json([document]));
 	}),
 
-	rest.post<DocumentTypeResponseModel[]>('/umbraco/management/api/v1/document-type/details/save', (req, res, ctx) => {
+	rest.post<DocumentTypeResponseModel>('/umbraco/management/api/v1/document-type/details/save', (req, res, ctx) => {
 		const data = req.body;
 		if (!data) return;
 
diff --git a/src/Umbraco.Web.UI.Client/src/core/mocks/domains/users.handlers.ts b/src/Umbraco.Web.UI.Client/src/core/mocks/domains/users.handlers.ts
index e6b8cea1fc..52f405beb1 100644
--- a/src/Umbraco.Web.UI.Client/src/core/mocks/domains/users.handlers.ts
+++ b/src/Umbraco.Web.UI.Client/src/core/mocks/domains/users.handlers.ts
@@ -66,7 +66,7 @@ export const handlers = [
 			mediaStartNodes: [],
 		};
 
-		const invited = umbUsersData.save([newUser]);
+		const invited = umbUsersData.save(newUser);
 
 		console.log('invited', invited);