diff --git a/apps/mobile/src/state/use-selected-thread-git-state.test.tsx b/apps/mobile/src/state/use-selected-thread-git-state.test.tsx
new file mode 100644
index 0000000000000..73c3b22d02abe
--- /dev/null
+++ b/apps/mobile/src/state/use-selected-thread-git-state.test.tsx
@@ -0,0 +1,106 @@
+import * as NodeChildProcess from "node:child_process";
+import * as NodeFS from "node:fs";
+import * as NodeOS from "node:os";
+import * as NodePath from "node:path";
+import { act, useLayoutEffect } from "react";
+import { createRoot } from "react-dom/client";
+import { expect, it, vi } from "vite-plus/test";
+
+const harness = vi.hoisted(() => ({
+  root: "",
+  cwd: "",
+}));
+
+vi.mock("./use-thread-selection", () => ({
+  useThreadSelection: () => ({
+    selectedThread: { environmentId: "environment-1" },
+    selectedThreadProject: { workspaceRoot: harness.root },
+  }),
+}));
+vi.mock("./use-selected-thread-worktree", () => ({
+  useSelectedThreadWorktree: () => ({ selectedThreadCwd: harness.cwd }),
+}));
+vi.mock("./use-vcs-action-state", () => ({
+  useVcsActionState: () => ({ currentLabel: null }),
+}));
+vi.mock("./sourceControl", () => ({
+  sourceControlEnvironment: { discovery: () => null },
+}));
+vi.mock("./query", () => ({ useEnvironmentQuery: () => ({ data: null }) }));
+vi.mock("./queries", () => ({
+  useBranches: ({ cwd }: { cwd: string }) => ({
+    data: {
+      refs: NodeChildProcess.execFileSync(
+        "git",
+        ["for-each-ref", "--format=%(refname:short) %(HEAD)", "refs/heads"],
+        {
+          cwd,
+          encoding: "utf8",
+        },
+      )
+        .trim()
+        .split("\n")
+        .map((line) => ({
+          name: line.split(" ")[0],
+          current: line.endsWith("*"),
+          isRemote: false,
+        })),
+    },
+    isPending: false,
+  }),
+}));
+
+import { useSelectedThreadGitState } from "./use-selected-thread-git-state";
+
+it("marks the selected checkout's branch current when switching threads in one project", () => {
+  const directory = NodeFS.mkdtempSync(NodePath.join(NodeOS.tmpdir(), "mobile-branches-"));
+  const git = (...args: string[]) =>
+    NodeChildProcess.execFileSync("git", ["-c", "commit.gpgsign=false", ...args], {
+      cwd: directory,
+      encoding: "utf8",
+      stdio: "pipe",
+    });
+  const root = createRoot(document.createElement("div"));
+  (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+  let currentBranches: string[] = [];
+  function Consumer() {
+    const { selectedThreadBranches } = useSelectedThreadGitState();
+    useLayoutEffect(() => {
+      currentBranches = selectedThreadBranches
+        .filter((branch) => branch.current)
+        .map((branch) => branch.name);
+    }, [selectedThreadBranches]);
+    return null;
+  }
+
+  try {
+    git("init", "--initial-branch=main");
+    git(
+      "-c",
+      "user.name=Test",
+      "-c",
+      "user.email=test@example.com",
+      "commit",
+      "--allow-empty",
+      "-m",
+      "initial",
+    );
+    const worktree = NodePath.join(directory, "linked");
+    git("worktree", "add", "-b", "feature/mobile", worktree);
+    harness.root = directory;
+    harness.cwd = directory;
+    act(() => root.render(<Consumer />));
+    expect(currentBranches).toEqual(["main"]);
+
+    harness.cwd = worktree;
+    act(() => root.render(<Consumer />));
+    expect(currentBranches).toEqual(["feature/mobile"]);
+
+    harness.cwd = directory;
+    act(() => root.render(<Consumer />));
+    expect(currentBranches).toEqual(["main"]);
+  } finally {
+    act(() => root.unmount());
+    NodeFS.rmSync(directory, { recursive: true, force: true });
+  }
+});
diff --git a/apps/mobile/src/state/use-selected-thread-git-state.ts b/apps/mobile/src/state/use-selected-thread-git-state.ts
index e8b3339c79493..e9a961b152fed 100644
--- a/apps/mobile/src/state/use-selected-thread-git-state.ts
+++ b/apps/mobile/src/state/use-selected-thread-git-state.ts
@@ -10,7 +10,7 @@ import { useThreadSelection } from "./use-thread-selection";
 import { useSelectedThreadWorktree } from "./use-selected-thread-worktree";
 
 export function useSelectedThreadGitState() {
-  const { selectedThread, selectedThreadProject } = useThreadSelection();
+  const { selectedThread } = useThreadSelection();
   const { selectedThreadCwd } = useSelectedThreadWorktree();
 
   const selectedThreadGitTarget = {
@@ -29,7 +29,7 @@ export function useSelectedThreadGitState() {
 
   const selectedThreadBranchTarget = {
     environmentId: selectedThread?.environmentId ?? null,
-    cwd: selectedThreadProject?.workspaceRoot ?? null,
+    cwd: selectedThreadCwd,
     query: null,
   };
   const selectedThreadBranchState = useBranches(selectedThreadBranchTarget);
diff --git a/apps/mobile/vite.config.ts b/apps/mobile/vite.config.ts
index 9ddb84efbc832..d64a6cb8ca27e 100644
--- a/apps/mobile/vite.config.ts
+++ b/apps/mobile/vite.config.ts
@@ -28,6 +28,7 @@ const reactTests = [
   "src/native/useRetryingImageSource.test.tsx",
   "src/state/queries.debounce.test.tsx",
   "src/state/use-selected-thread-git-actions.test.tsx",
+  "src/state/use-selected-thread-git-state.test.tsx",
   "src/features/terminal/useTerminalExitNavigation.test.tsx",
   "src/features/threads/use-thread-list-now.test.tsx",
   "src/features/home/home-list-options.test.tsx",