diff --git a/src/resources/extensions/sf/tests/parallel-orchestrator-zombie-cleanup.test.ts b/src/resources/extensions/sf/tests/parallel-orchestrator-zombie-cleanup.test.ts
index 8bb196319..263d77800 100644
--- a/src/resources/extensions/sf/tests/parallel-orchestrator-zombie-cleanup.test.ts
+++ b/src/resources/extensions/sf/tests/parallel-orchestrator-zombie-cleanup.test.ts
@@ -13,7 +13,7 @@ import { randomUUID } from "node:crypto";
 import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { test, afterEach } from 'vitest';
+import { test, afterEach, beforeEach } from 'vitest';
 
 import {
 	getOrchestratorState,
@@ -73,14 +73,16 @@ function writeSessionStatusFile(
 // killable by this process, but 2147483647 is unlikely to exist.
 const _DEAD_PID = 2147483647;
 
+// Reset module-level orchestrator state before every test so the shared
+// `state` singleton in parallel-orchestrator.ts can't leak across tests.
+beforeEach(() => {
+	resetOrchestrator();
+});
+
 // ─── refreshWorkerStatuses: deactivates when all workers dead ──────────
 
 test("#2736: refreshWorkerStatuses deactivates orchestrator when all workers are error/stopped", (t) => {
 	const base = makeTmpBase();
-	afterEach(() => {
-		resetOrchestrator();
-		cleanup(base);
-	});
 
 	// Seed persisted state with two workers using current PID (alive) so
 	// restoreState() accepts them, then immediately mark them as error via