diff --git a/src/components/AppBar/tests/ProjectButtons.test.tsx b/src/components/AppBar/tests/ProjectButtons.test.tsx
index b332c90324..c8de51657e 100644
--- a/src/components/AppBar/tests/ProjectButtons.test.tsx
+++ b/src/components/AppBar/tests/ProjectButtons.test.tsx
@@ -18,13 +18,15 @@ import { Goal, GoalStatus } from "types/goals";
 import { Path } from "types/path";
 import { themeColors } from "types/theme";
 
+jest.mock("react-router-dom", () => ({
+  useNavigate: jest.fn(),
+}));
+
 jest.mock("backend", () => ({
   hasPermission: (perm: Permission) => mockHasPermission(perm),
   isSiteAdmin: () => mockIsSiteAdmin(),
 }));
-jest.mock("react-router-dom", () => ({
-  useNavigate: jest.fn(),
-}));
+jest.mock("components/Project/ProjectActions", () => ({}));
 
 const mockHasPermission = jest.fn();
 const mockIsSiteAdmin = jest.fn();
diff --git a/src/components/AppBar/tests/SpeakerMenu.test.tsx b/src/components/AppBar/tests/SpeakerMenu.test.tsx
index f1f19ed782..12637fc695 100644
--- a/src/components/AppBar/tests/SpeakerMenu.test.tsx
+++ b/src/components/AppBar/tests/SpeakerMenu.test.tsx
@@ -15,6 +15,7 @@ import { randomSpeaker } from "types/project";
 jest.mock("backend", () => ({
   getAllSpeakers: () => mockGetAllSpeakers(),
 }));
+jest.mock("components/Project/ProjectActions", () => ({}));
 
 const mockProjId = "mock-project-id";
 const mockGetAllSpeakers = jest.fn();
diff --git a/src/components/AppBar/tests/UserMenu.test.tsx b/src/components/AppBar/tests/UserMenu.test.tsx
index 40876b8377..4ae1909c9a 100644
--- a/src/components/AppBar/tests/UserMenu.test.tsx
+++ b/src/components/AppBar/tests/UserMenu.test.tsx
@@ -15,6 +15,7 @@ jest.mock("backend/localStorage", () => ({
   getAvatar: jest.fn(),
   getCurrentUser: jest.fn(),
 }));
+jest.mock("components/Project/ProjectActions", () => ({}));
 jest.mock("react-router-dom", () => ({
   useNavigate: jest.fn(),
 }));
diff --git a/src/components/DataEntry/DataEntryTable/NewEntry/tests/index.test.tsx b/src/components/DataEntry/DataEntryTable/NewEntry/tests/index.test.tsx
index 0214822a07..21690692bb 100644
--- a/src/components/DataEntry/DataEntryTable/NewEntry/tests/index.test.tsx
+++ b/src/components/DataEntry/DataEntryTable/NewEntry/tests/index.test.tsx
@@ -19,6 +19,7 @@ jest.mock(
   () => (props: any) => mockAutocomplete(props)
 );
 
+jest.mock("components/Project/ProjectActions", () => ({}));
 jest.mock("components/Pronunciations/PronunciationsFrontend", () => "div");
 
 /** Bypass the Autocomplete and render its internal input with the props of both. */
diff --git a/src/components/DataEntry/DataEntryTable/tests/RecentEntry.test.tsx b/src/components/DataEntry/DataEntryTable/tests/RecentEntry.test.tsx
index 1101939a44..da04922143 100644
--- a/src/components/DataEntry/DataEntryTable/tests/RecentEntry.test.tsx
+++ b/src/components/DataEntry/DataEntryTable/tests/RecentEntry.test.tsx
@@ -27,6 +27,8 @@ import { newWritingSystem } from "types/writingSystem";
 
 jest.mock("@mui/material/Autocomplete", () => "div");
 
+jest.mock("components/Project/ProjectActions", () => ({}));
+
 const mockStore = configureMockStore()(defaultState);
 const mockVern = "Vernacular";
 const mockGloss = "Gloss";
diff --git a/src/components/DataEntry/DataEntryTable/tests/index.test.tsx b/src/components/DataEntry/DataEntryTable/tests/index.test.tsx
index baf6075ee7..c6a955cb45 100644
--- a/src/components/DataEntry/DataEntryTable/tests/index.test.tsx
+++ b/src/components/DataEntry/DataEntryTable/tests/index.test.tsx
@@ -57,6 +57,7 @@ jest.mock(
   "components/DataEntry/DataEntryTable/RecentEntry",
   () => MockRecentEntry
 );
+jest.mock("components/Project/ProjectActions", () => ({}));
 jest.mock("components/Pronunciations/PronunciationsFrontend", () => "div");
 
 jest.spyOn(window, "alert").mockImplementation(() => {});
diff --git a/src/components/GoalTimeline/tests/GoalRedux.test.tsx b/src/components/GoalTimeline/tests/GoalRedux.test.tsx
index 0a62d9bde8..9afc3661c7 100644
--- a/src/components/GoalTimeline/tests/GoalRedux.test.tsx
+++ b/src/components/GoalTimeline/tests/GoalRedux.test.tsx
@@ -49,6 +49,7 @@ jest.mock("backend", () => ({
 jest.mock("browserRouter", () => ({
   navigate: (path: Path) => mockNavigate(path),
 }));
+jest.mock("components/Project/ProjectActions", () => ({}));
 jest.mock("components/Pronunciations/Recorder");
 
 const mockAddGoalToUserEdit = jest.fn();
diff --git a/src/components/GoalTimeline/tests/index.test.tsx b/src/components/GoalTimeline/tests/index.test.tsx
index 8ba3017ee0..b2ca67a4cc 100644
--- a/src/components/GoalTimeline/tests/index.test.tsx
+++ b/src/components/GoalTimeline/tests/index.test.tsx
@@ -19,6 +19,7 @@ jest.mock("components/GoalTimeline/Redux/GoalActions", () => ({
   asyncAddGoal: (goal: Goal) => mockChooseGoal(goal),
   asyncGetUserEdits: () => jest.fn(),
 }));
+jest.mock("components/Project/ProjectActions", () => ({}));
 jest.mock("components/Pronunciations/Recorder");
 jest.mock("types/hooks", () => {
   return {
diff --git a/src/components/Project/tests/ProjectActions.test.tsx b/src/components/Project/tests/ProjectActions.test.tsx
index 9660507e1e..602261ce06 100644
--- a/src/components/Project/tests/ProjectActions.test.tsx
+++ b/src/components/Project/tests/ProjectActions.test.tsx
@@ -8,6 +8,7 @@ import {
   asyncUpdateCurrentProject,
   clearCurrentProject,
 } from "components/Project/ProjectActions";
+import { defaultState as currentProjectState } from "components/Project/ProjectReduxTypes";
 import { type RootState, setupStore } from "store";
 import { newProject } from "types/project";
 import { newUser } from "types/user";
@@ -17,6 +18,8 @@ jest.mock("backend", () => ({
   getAllSemanticDomainNames: (lang?: string) => mockGetAllSemDomNames(lang),
   updateProject: (proj: Project) => mockUpdateProject(proj),
 }));
+// Mock "i18n", else `thrown: "Error: Error: connect ECONNREFUSED ::1:80 [...]`
+jest.mock("i18n", () => ({ language: "" }));
 
 const mockGetAllProjectUsers = jest.fn();
 const mockGetAllSemDomNames = jest.fn();
@@ -40,6 +43,7 @@ describe("ProjectActions", () => {
       const store = setupStore({
         ...persistedDefaultState,
         currentProjectState: {
+          ...currentProjectState,
           project: proj,
           speaker: {} as Speaker,
           users: [newUser()],
@@ -59,6 +63,7 @@ describe("ProjectActions", () => {
       const store = setupStore({
         ...persistedDefaultState,
         currentProjectState: {
+          ...currentProjectState,
           project: proj,
           speaker: {} as Speaker,
           users: [newUser()],
@@ -73,21 +78,33 @@ describe("ProjectActions", () => {
       expect(users).toHaveLength(1);
     });
 
-    it("fetches semantic domain names when semDomWritingSystem changes", async () => {
+    it("fetches semantic domain names when empty", async () => {
+      const store = setupStore({ ...persistedDefaultState });
+
+      // First project loaded
       const proj: Project = { ...newProject(), id: mockProjId };
+      await store.dispatch(asyncUpdateCurrentProject(proj));
+      expect(mockUpdateProject).toHaveBeenCalledTimes(1);
+      expect(mockGetAllSemDomNames).toHaveBeenCalledTimes(1);
+    });
+
+    it("fetches semantic domain names when semDomWritingSystem changes", async () => {
       const store = setupStore({
         ...persistedDefaultState,
         currentProjectState: {
-          project: proj,
-          speaker: {} as Speaker,
-          users: [newUser()],
+          ...currentProjectState,
+          project: { ...newProject(), id: mockProjId },
+          semanticDomains: { ["1"]: "one" },
         },
       });
 
-      await store.dispatch(asyncUpdateCurrentProject({ ...proj, id: "newId" }));
+      // Project changed but same sem dom language
+      const proj: Project = { ...newProject(), id: "new-proj-id" };
+      await store.dispatch(asyncUpdateCurrentProject(proj));
       expect(mockUpdateProject).toHaveBeenCalledTimes(1);
       expect(mockGetAllSemDomNames).not.toHaveBeenCalled();
 
+      // Sem dom language change in project
       const lang = "es";
       const semDomWritingSystem = { ...proj.semDomWritingSystem, bcp47: lang };
       await store.dispatch(
@@ -101,41 +118,44 @@ describe("ProjectActions", () => {
 
   describe("asyncRefreshProjectUsers", () => {
     it("correctly affects state", async () => {
-      const proj: Project = { ...newProject(), id: mockProjId };
       const store = setupStore({
         ...persistedDefaultState,
         currentProjectState: {
-          project: proj,
+          ...currentProjectState,
+          project: { ...newProject(), id: mockProjId },
+          semanticDomains: { ["1"]: "one" },
           speaker: {} as Speaker,
-          users: [],
         },
       });
       const mockUsers = [newUser(), newUser(), newUser()];
       mockGetAllProjectUsers.mockResolvedValueOnce(mockUsers);
       await store.dispatch(asyncRefreshProjectUsers("mockProjId"));
-      const { project, speaker, users } = store.getState().currentProjectState;
-      expect(project.id).toEqual(mockProjId);
-      expect(speaker).not.toBeUndefined();
-      expect(users).toHaveLength(mockUsers.length);
+      const projState = store.getState().currentProjectState;
+      expect(projState.project.id).toEqual(mockProjId);
+      expect(projState.semanticDomains).not.toBeUndefined();
+      expect(projState.speaker).not.toBeUndefined();
+      expect(projState.users).toHaveLength(mockUsers.length);
     });
   });
 
   describe("clearCurrentProject", () => {
     it("correctly affects state", () => {
-      const nonDefaultState = {
-        project: { ...newProject(), id: "nonempty-string" },
-        speaker: {} as Speaker,
-        users: [newUser()],
-      };
       const store = setupStore({
         ...persistedDefaultState,
-        currentProjectState: nonDefaultState,
+        currentProjectState: {
+          ...currentProjectState,
+          project: { ...newProject(), id: mockProjId },
+          semanticDomains: { ["1"]: "one" },
+          speaker: {} as Speaker,
+          users: [newUser()],
+        },
       });
       store.dispatch(clearCurrentProject());
-      const { project, speaker, users } = store.getState().currentProjectState;
-      expect(project.id).toEqual("");
-      expect(speaker).toBeUndefined();
-      expect(users).toHaveLength(0);
+      const projState = store.getState().currentProjectState;
+      expect(projState.project.id).toEqual("");
+      expect(projState.semanticDomains).toBeUndefined();
+      expect(projState.speaker).toBeUndefined();
+      expect(projState.users).toHaveLength(0);
     });
   });
 
diff --git a/src/components/ProjectExport/Redux/tests/ExportProjectActions.test.tsx b/src/components/ProjectExport/Redux/tests/ExportProjectActions.test.tsx
index 5ff440a77a..55b6d2b109 100644
--- a/src/components/ProjectExport/Redux/tests/ExportProjectActions.test.tsx
+++ b/src/components/ProjectExport/Redux/tests/ExportProjectActions.test.tsx
@@ -14,6 +14,7 @@ jest.mock("backend", () => ({
   downloadLift: (...args: any[]) => mockDownloadList(...args),
   exportLift: (...args: any[]) => mockExportLift(...args),
 }));
+jest.mock("components/Project/ProjectActions", () => ({}));
 
 const mockDownloadList = jest.fn();
 const mockExportLift = jest.fn();
diff --git a/src/components/ProjectScreen/tests/CreateProject.test.tsx b/src/components/ProjectScreen/tests/CreateProject.test.tsx
index f87d550a1b..0dbffed78c 100644
--- a/src/components/ProjectScreen/tests/CreateProject.test.tsx
+++ b/src/components/ProjectScreen/tests/CreateProject.test.tsx
@@ -23,6 +23,8 @@ jest.mock("backend", () => ({
   projectDuplicateCheck: () => mockProjectDuplicateCheck(),
   uploadLiftAndGetWritingSystems: () => mockUploadLiftAndGetWritingSystems(),
 }));
+// Mock "i18n", else `thrown: "Error: Error: connect ECONNREFUSED ::1:80 [...]`
+jest.mock("i18n", () => ({ language: "" }));
 
 const mockProjectDuplicateCheck = jest.fn();
 const mockUploadLiftAndGetWritingSystems = jest.fn();
@@ -42,7 +44,6 @@ const mockSubmitEvent = (): Partial<React.FormEvent<HTMLFormElement>> => ({
 
 let projectMaster: ReactTestRenderer;
 let projectHandle: ReactTestInstance;
-4;
 
 beforeAll(async () => {
   await act(async () => {
diff --git a/src/components/ProjectSettings/tests/index.test.tsx b/src/components/ProjectSettings/tests/index.test.tsx
index c3b9ad80f8..231d3d3b5a 100644
--- a/src/components/ProjectSettings/tests/index.test.tsx
+++ b/src/components/ProjectSettings/tests/index.test.tsx
@@ -34,6 +34,8 @@ jest.mock("backend", () => ({
   getUserRoles: () => Promise.resolve([]),
 }));
 jest.mock("components/Project/ProjectActions");
+// Mock "i18n", else `thrown: "Error: Error: connect ECONNREFUSED ::1:80 [...]`
+jest.mock("i18n", () => ({ language: "" }));
 jest.mock("types/hooks", () => {
   return {
     ...jest.requireActual("types/hooks"),
diff --git a/src/components/SiteSettings/tests/index.test.tsx b/src/components/SiteSettings/tests/index.test.tsx
index 42199d14d2..5486df4140 100644
--- a/src/components/SiteSettings/tests/index.test.tsx
+++ b/src/components/SiteSettings/tests/index.test.tsx
@@ -15,6 +15,7 @@ jest.mock("backend", () => ({
   getAllUsers: (...args: any[]) => mockGetAllUsers(...args),
   getBannerText: (...args: any[]) => mockGetBannerText(...args),
 }));
+jest.mock("components/Project/ProjectActions", () => ({}));
 
 const setupMocks = (): void => {
   mockGetAllProjects.mockResolvedValue([]);
diff --git a/src/goals/CharacterInventory/CharInv/CharacterDetail/tests/index.test.tsx b/src/goals/CharacterInventory/CharInv/CharacterDetail/tests/index.test.tsx
index 2ca7dc4820..d1e332c4b0 100644
--- a/src/goals/CharacterInventory/CharInv/CharacterDetail/tests/index.test.tsx
+++ b/src/goals/CharacterInventory/CharInv/CharacterDetail/tests/index.test.tsx
@@ -24,6 +24,7 @@ jest.mock("@mui/material", () => {
   };
 });
 
+jest.mock("components/Project/ProjectActions", () => ({}));
 jest.mock(
   "goals/CharacterInventory/CharInv/CharacterDetail/FindAndReplace/FindAndReplaceActions",
   () => ({
diff --git a/src/goals/ReviewEntries/ReviewEntriesTable/CellComponents/tests/PronunciationsCell.test.tsx b/src/goals/ReviewEntries/ReviewEntriesTable/CellComponents/tests/PronunciationsCell.test.tsx
index cf93ffe7d3..5d1b689306 100644
--- a/src/goals/ReviewEntries/ReviewEntriesTable/CellComponents/tests/PronunciationsCell.test.tsx
+++ b/src/goals/ReviewEntries/ReviewEntriesTable/CellComponents/tests/PronunciationsCell.test.tsx
@@ -15,6 +15,7 @@ import { StoreState } from "types";
 import theme from "types/theme";
 import { newPronunciation } from "types/word";
 
+jest.mock("components/Project/ProjectActions", () => ({}));
 // Mock the store interactions
 jest.mock("goals/ReviewEntries/Redux/ReviewEntriesActions", () => ({
   deleteAudio: (...args: any[]) => mockDeleteAudio(...args),