diff --git a/src/components/App/DefaultState.ts b/src/components/App/DefaultState.ts
index bd02c8bf73..25186a03dd 100644
--- a/src/components/App/DefaultState.ts
+++ b/src/components/App/DefaultState.ts
@@ -5,7 +5,7 @@ import { defaultState as exportProjectState } from "components/ProjectExport/Red
 import { defaultState as pronunciationsState } from "components/Pronunciations/Redux/PronunciationsReduxTypes";
 import { defaultState as treeViewState } from "components/TreeView/Redux/TreeViewReduxTypes";
 import { defaultState as characterInventoryState } from "goals/CharacterInventory/Redux/CharacterInventoryReduxTypes";
-import { defaultState as mergeDuplicateGoal } from "goals/MergeDuplicates/Redux/MergeDupsReducer";
+import { defaultState as mergeDuplicateGoal } from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
 import { defaultState as reviewEntriesState } from "goals/ReviewEntries/Redux/ReviewEntriesReduxTypes";
 import { defaultState as analyticsState } from "types/Redux/analyticsReduxTypes";
 
diff --git a/src/goals/MergeDuplicates/MergeDupsStep/MergeDragDrop/tests/index.test.tsx b/src/goals/MergeDuplicates/MergeDupsStep/MergeDragDrop/tests/index.test.tsx
index 82735cbdb2..b35f4eb8b3 100644
--- a/src/goals/MergeDuplicates/MergeDupsStep/MergeDragDrop/tests/index.test.tsx
+++ b/src/goals/MergeDuplicates/MergeDupsStep/MergeDragDrop/tests/index.test.tsx
@@ -1,21 +1,24 @@
 import { IconButton } from "@mui/material";
 import { Provider } from "react-redux";
-import { ReactTestRenderer, act, create } from "react-test-renderer";
+import { type ReactTestRenderer, act, create } from "react-test-renderer";
 import configureMockStore from "redux-mock-store";
 
 import "tests/reactI18nextMock";
 
-import { GramCatGroup, Sense } from "api/models";
+import { GramCatGroup, type Sense } from "api/models";
 import { defaultState } from "components/App/DefaultState";
 import MergeDragDrop from "goals/MergeDuplicates/MergeDupsStep/MergeDragDrop";
 import DragSense from "goals/MergeDuplicates/MergeDupsStep/MergeDragDrop/DragSense";
 import DropWord from "goals/MergeDuplicates/MergeDupsStep/MergeDragDrop/DropWord";
 import {
   convertSenseToMergeTreeSense,
-  defaultSidebar,
+  defaultTree,
   newMergeTreeWord,
 } from "goals/MergeDuplicates/MergeDupsTreeTypes";
-import { MergeTreeState } from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
+import {
+  type MergeTreeState,
+  defaultState as mergeState,
+} from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
 import { newSemanticDomain } from "types/semanticDomain";
 import {
   newDefinition,
@@ -90,6 +93,7 @@ const wordFoo2 = {
 //     vern: foo
 //     senses: bar, baz
 const mockTwoWordState = (): MergeTreeState => ({
+  ...mergeState,
   data: {
     senses: {
       [senseBah.guid]: convertSenseToMergeTreeSense(senseBah, wordFoo1.id, 0),
@@ -100,7 +104,7 @@ const mockTwoWordState = (): MergeTreeState => ({
     words: { [wordFoo1.id]: wordFoo1, [wordFoo2.id]: wordFoo2 },
   },
   tree: {
-    sidebar: defaultSidebar,
+    ...defaultTree,
     words: {
       [wordFoo1.id]: newMergeTreeWord(wordFoo1.vernacular, {
         word1_senseA: [senseBah.guid, senseBaj.guid],
@@ -111,7 +115,6 @@ const mockTwoWordState = (): MergeTreeState => ({
       }),
     },
   },
-  mergeWords: [],
 });
 
 const renderMergeDragDrop = async (
diff --git a/src/goals/MergeDuplicates/MergeDupsTreeTypes.ts b/src/goals/MergeDuplicates/MergeDupsTreeTypes.ts
index 09c03f3823..ce1dbf2dc7 100644
--- a/src/goals/MergeDuplicates/MergeDupsTreeTypes.ts
+++ b/src/goals/MergeDuplicates/MergeDupsTreeTypes.ts
@@ -1,7 +1,7 @@
 import { v4 } from "uuid";
 
-import { Flag, Sense, Status, Word } from "api/models";
-import { Hash } from "types/hash";
+import { type Flag, type Sense, Status, type Word } from "api/models";
+import { type Hash } from "types/hash";
 import { newFlag, newSense } from "types/word";
 
 export interface MergeTreeSense {
@@ -16,6 +16,8 @@ export interface MergeData {
   senses: Hash<MergeTreeSense>;
 }
 
+export const defaultData: MergeData = { words: {}, senses: {} };
+
 export interface MergeTreeReference {
   wordId: string;
   mergeSenseId: string;
diff --git a/src/goals/MergeDuplicates/Redux/MergeDupsReducer.ts b/src/goals/MergeDuplicates/Redux/MergeDupsReducer.ts
index 27bd01e34d..55de7981f0 100644
--- a/src/goals/MergeDuplicates/Redux/MergeDupsReducer.ts
+++ b/src/goals/MergeDuplicates/Redux/MergeDupsReducer.ts
@@ -3,34 +3,27 @@ import { v4 } from "uuid";
 
 import {
   GramCatGroup,
-  MergeSourceWord,
-  MergeWords,
+  type MergeSourceWord,
+  type MergeWords,
   Status,
-  Word,
+  type Word,
 } from "api/models";
 import {
+  type MergeData,
+  type MergeTreeSense,
+  type MergeTreeWord,
   convertSenseToMergeTreeSense,
   convertWordToMergeTreeWord,
   defaultSidebar,
   defaultTree,
-  MergeData,
-  MergeTreeSense,
-  MergeTreeWord,
   newMergeTreeWord,
 } from "goals/MergeDuplicates/MergeDupsTreeTypes";
 import { newMergeWords } from "goals/MergeDuplicates/MergeDupsTypes";
-import { MergeTreeState } from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
+import { defaultState } from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
 import { StoreActionTypes } from "rootActions";
-import { Hash } from "types/hash";
+import { type Hash } from "types/hash";
 import { compareFlags } from "utilities/wordUtilities";
 
-const defaultData = { words: {}, senses: {} };
-export const defaultState: MergeTreeState = {
-  data: defaultData,
-  tree: defaultTree,
-  mergeWords: [],
-};
-
 const mergeDuplicatesSlice = createSlice({
   name: "mergeDupStepReducer",
   initialState: defaultState,
@@ -268,8 +261,8 @@ const mergeDuplicatesSlice = createSlice({
           });
           wordsTree[word.id] = convertWordToMergeTreeWord(word);
         });
-        state.tree.words = wordsTree;
         state.data = { senses, words };
+        state.tree = { ...defaultTree, words: wordsTree };
         state.mergeWords = [];
       }
     },
diff --git a/src/goals/MergeDuplicates/Redux/MergeDupsReduxTypes.ts b/src/goals/MergeDuplicates/Redux/MergeDupsReduxTypes.ts
index 73ab2148b3..3633741662 100644
--- a/src/goals/MergeDuplicates/Redux/MergeDupsReduxTypes.ts
+++ b/src/goals/MergeDuplicates/Redux/MergeDupsReduxTypes.ts
@@ -1,10 +1,28 @@
-import { Flag, MergeWords } from "api/models";
+import { type Flag, type MergeWords } from "api/models";
 import {
-  MergeData,
-  MergeTree,
-  MergeTreeReference,
+  type MergeData,
+  type MergeTree,
+  type MergeTreeReference,
+  defaultData,
+  defaultTree,
 } from "goals/MergeDuplicates/MergeDupsTreeTypes";
 
+// Redux state
+
+export interface MergeTreeState {
+  data: MergeData;
+  tree: MergeTree;
+  mergeWords: MergeWords[];
+}
+
+export const defaultState: MergeTreeState = {
+  data: defaultData,
+  tree: defaultTree,
+  mergeWords: [],
+};
+
+// Action payloads
+
 export interface CombineSenseMergePayload {
   src: MergeTreeReference;
   dest: MergeTreeReference;
@@ -15,12 +33,6 @@ export interface FlagWordPayload {
   flag: Flag;
 }
 
-export interface MergeTreeState {
-  data: MergeData;
-  tree: MergeTree;
-  mergeWords: MergeWords[];
-}
-
 export interface MoveSensePayload extends OrderSensePayload {
   destWordId: string;
 }
diff --git a/src/goals/MergeDuplicates/Redux/tests/MergeDupsActions.test.tsx b/src/goals/MergeDuplicates/Redux/tests/MergeDupsActions.test.tsx
index 8032e10d1f..31e36f5c1d 100644
--- a/src/goals/MergeDuplicates/Redux/tests/MergeDupsActions.test.tsx
+++ b/src/goals/MergeDuplicates/Redux/tests/MergeDupsActions.test.tsx
@@ -1,9 +1,9 @@
-import { MergeWords, Sense, Status, Word } from "api/models";
+import { type MergeWords, type Sense, Status, type Word } from "api/models";
 import { defaultState } from "components/App/DefaultState";
 import {
+  type MergeData,
+  type MergeTree,
   defaultTree,
-  MergeData,
-  MergeTree,
   newMergeTreeSense,
   newMergeTreeWord,
 } from "goals/MergeDuplicates/MergeDupsTreeTypes";
@@ -14,6 +14,7 @@ import {
   mergeAll,
   setData,
 } from "goals/MergeDuplicates/Redux/MergeDupsActions";
+import { defaultState as defaultMergeState } from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
 import { goalDataMock } from "goals/MergeDuplicates/Redux/tests/MergeDupsDataMock";
 import { setupStore } from "store";
 import { GoalType } from "types/goals";
@@ -78,14 +79,15 @@ const S1 = senses["S1"].guid;
 const S2 = senses["S2"].guid;
 const S3 = senses["S3"].guid;
 const S4 = senses["S4"].guid;
-const data: MergeData = { words: { WA: wordA, WB: wordB }, senses: {} };
-data.senses[S1] = {
-  ...newMergeTreeSense("S1", idA, 0, S1),
-  protected: true,
+const data: MergeData = {
+  words: { WA: wordA, WB: wordB },
+  senses: {
+    [S1]: { ...newMergeTreeSense("S1", idA, 0, S1), protected: true },
+    [S2]: newMergeTreeSense("S2", idA, 1, S2),
+    [S3]: newMergeTreeSense("S3", idB, 0, S3),
+    [S4]: newMergeTreeSense("S4", idB, 1, S4),
+  },
 };
-data.senses[S2] = newMergeTreeSense("S2", idA, 1, S2);
-data.senses[S3] = newMergeTreeSense("S3", idB, 0, S3);
-data.senses[S4] = newMergeTreeSense("S4", idB, 1, S4);
 
 beforeEach(jest.clearAllMocks);
 
@@ -98,7 +100,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA, WB } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       await store.dispatch(mergeAll());
 
@@ -112,7 +114,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA, WB } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       await store.dispatch(mergeAll());
 
@@ -137,7 +139,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA, WB } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       await store.dispatch(mergeAll());
 
@@ -166,7 +168,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA, WB } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       await store.dispatch(mergeAll());
 
@@ -185,7 +187,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA, WB } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       await store.dispatch(mergeAll());
 
@@ -202,7 +204,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       await store.dispatch(mergeAll());
 
@@ -220,7 +222,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA, WB } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       await store.dispatch(mergeAll());
 
@@ -238,7 +240,6 @@ describe("MergeDupActions", () => {
     it("creates an action to add MergeDups data", () => {
       const goal = new MergeDups();
       goal.steps = [{ words: [...goalDataMock.plannedWords[0]] }];
-
       const store = setupStore();
       store.dispatch(dispatchMergeStepData(goal));
       const setDataAction = setData(goalDataMock.plannedWords[0]);
@@ -254,7 +255,7 @@ describe("MergeDupActions", () => {
       const tree: MergeTree = { ...defaultTree, words: { WA, WB } };
       const store = setupStore({
         ...preloadedState,
-        mergeDuplicateGoal: { data, tree, mergeWords: [] },
+        mergeDuplicateGoal: { ...defaultMergeState, data, tree },
       });
       store.dispatch(deferMerge());
       expect(mockGraylistAdd).toHaveBeenCalledTimes(1);
diff --git a/src/goals/MergeDuplicates/Redux/tests/MergeDupsDataMock.ts b/src/goals/MergeDuplicates/Redux/tests/MergeDupsDataMock.ts
index cfe62e0b3c..00e759af71 100644
--- a/src/goals/MergeDuplicates/Redux/tests/MergeDupsDataMock.ts
+++ b/src/goals/MergeDuplicates/Redux/tests/MergeDupsDataMock.ts
@@ -5,10 +5,11 @@ import { defaultState } from "components/App/DefaultState";
 import {
   convertSenseToMergeTreeSense,
   convertWordToMergeTreeWord,
-  defaultSidebar,
+  defaultTree,
   newMergeTreeWord,
 } from "goals/MergeDuplicates/MergeDupsTreeTypes";
 import { type MergeDupsData } from "goals/MergeDuplicates/MergeDupsTypes";
+import { defaultState as mergeState } from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
 import { type RootState } from "store";
 import { newSense, newWord, simpleWord } from "types/word";
 
@@ -122,6 +123,7 @@ export const mergeTwoWordsScenario: GetMergeWordsScenario = {
     return {
       ...persistedDefaultState,
       mergeDuplicateGoal: {
+        ...mergeState,
         data: {
           senses: {
             [senseBah.guid]: convertSenseToMergeTreeSense(
@@ -146,7 +148,7 @@ export const mergeTwoWordsScenario: GetMergeWordsScenario = {
           },
         },
         tree: {
-          sidebar: defaultSidebar,
+          ...defaultTree,
           words: {
             [wordFoo2.id]: convertWordToMergeTreeWord({
               ...wordFoo2,
@@ -154,7 +156,6 @@ export const mergeTwoWordsScenario: GetMergeWordsScenario = {
             }),
           },
         },
-        mergeWords: [],
       },
     };
   },
@@ -184,6 +185,7 @@ export const mergeTwoSensesScenario: GetMergeWordsScenario = {
     return {
       ...persistedDefaultState,
       mergeDuplicateGoal: {
+        ...mergeState,
         data: {
           senses: {
             [senseBah.guid]: convertSenseToMergeTreeSense(
@@ -208,7 +210,7 @@ export const mergeTwoSensesScenario: GetMergeWordsScenario = {
           },
         },
         tree: {
-          sidebar: defaultSidebar,
+          ...defaultTree,
           words: {
             [wordFoo2.id]: newMergeTreeWord(wordFoo2.vernacular, {
               word2_senseA: [senseBar.guid],
@@ -216,7 +218,6 @@ export const mergeTwoSensesScenario: GetMergeWordsScenario = {
             }),
           },
         },
-        mergeWords: [],
       },
     };
   },
@@ -246,6 +247,7 @@ export const mergeTwoDefinitionsScenario: GetMergeWordsScenario = {
     return {
       ...persistedDefaultState,
       mergeDuplicateGoal: {
+        ...mergeState,
         data: {
           senses: {
             [senseBah.guid]: convertSenseToMergeTreeSense(
@@ -270,7 +272,7 @@ export const mergeTwoDefinitionsScenario: GetMergeWordsScenario = {
           },
         },
         tree: {
-          sidebar: defaultSidebar,
+          ...defaultTree,
           words: {
             [wordFoo2.id]: newMergeTreeWord(wordFoo2.vernacular, {
               word2_senseA: [senseBar.guid],
@@ -278,7 +280,6 @@ export const mergeTwoDefinitionsScenario: GetMergeWordsScenario = {
             }),
           },
         },
-        mergeWords: [],
       },
     };
   },
diff --git a/src/goals/MergeDuplicates/Redux/tests/MergeDupsReducer.test.tsx b/src/goals/MergeDuplicates/Redux/tests/MergeDupsReducer.test.tsx
index 5785df9d05..cdfb809dbf 100644
--- a/src/goals/MergeDuplicates/Redux/tests/MergeDupsReducer.test.tsx
+++ b/src/goals/MergeDuplicates/Redux/tests/MergeDupsReducer.test.tsx
@@ -1,10 +1,10 @@
-import { Action, PayloadAction } from "@reduxjs/toolkit";
+import { type Action, type PayloadAction } from "@reduxjs/toolkit";
 
 import {
+  type MergeTreeReference,
+  type MergeTreeWord,
   convertSenseToMergeTreeSense,
-  defaultSidebar,
-  MergeTreeReference,
-  MergeTreeWord,
+  defaultTree,
   newMergeTreeWord,
 } from "goals/MergeDuplicates/MergeDupsTreeTypes";
 import {
@@ -17,18 +17,19 @@ import {
   orderSense,
   setData,
 } from "goals/MergeDuplicates/Redux/MergeDupsActions";
-import mergeDupStepReducer, {
+import mergeDupStepReducer from "goals/MergeDuplicates/Redux/MergeDupsReducer";
+import {
+  type MergeTreeState,
   defaultState,
-} from "goals/MergeDuplicates/Redux/MergeDupsReducer";
-import { MergeTreeState } from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
+} from "goals/MergeDuplicates/Redux/MergeDupsReduxTypes";
 import {
   mergeTwoDefinitionsScenario,
   mergeTwoSensesScenario,
   mergeTwoWordsScenario,
 } from "goals/MergeDuplicates/Redux/tests/MergeDupsDataMock";
-import { StoreAction, StoreActionTypes } from "rootActions";
+import { type StoreAction, StoreActionTypes } from "rootActions";
 import { setupStore } from "store";
-import { Hash } from "types/hash";
+import { type Hash } from "types/hash";
 import { newFlag, testWordList } from "types/word";
 
 jest.mock("uuid");
@@ -91,15 +92,8 @@ describe("MergeDupsReducer", () => {
     };
   }
   const mockState: MergeTreeState = {
-    data: {
-      words: {},
-      senses: {},
-    },
-    tree: {
-      sidebar: defaultSidebar,
-      words: testTreeWords(),
-    },
-    mergeWords: [],
+    ...defaultState,
+    tree: { ...defaultTree, words: testTreeWords() },
   };
   function checkTreeWords(
     action: Action | PayloadAction,