diff --git a/modules/testing/builder/src/builder-harness.ts b/modules/testing/builder/src/builder-harness.ts
index ecee882739d8..092206698f83 100644
--- a/modules/testing/builder/src/builder-harness.ts
+++ b/modules/testing/builder/src/builder-harness.ts
@@ -115,6 +115,10 @@ export class BuilderHarness<T> {
     return join(getSystemPath(this.host.root()), path);
   }
 
+  resetProjectMetadata(): void {
+    this.projectMetadata = DEFAULT_PROJECT_METADATA;
+  }
+
   useProject(name: string, metadata: Record<string, unknown> = {}): this {
     if (!name) {
       throw new Error('Project name cannot be an empty string.');
diff --git a/modules/testing/builder/src/jasmine-helpers.ts b/modules/testing/builder/src/jasmine-helpers.ts
index b204d507bab8..15045a2f56d5 100644
--- a/modules/testing/builder/src/jasmine-helpers.ts
+++ b/modules/testing/builder/src/jasmine-helpers.ts
@@ -37,7 +37,11 @@ export function describeBuilder<T>(
   });
 
   describe(options.name || builderHandler.name, () => {
-    beforeEach(() => host.initialize().toPromise());
+    beforeEach(async () => {
+      harness.resetProjectMetadata();
+
+      await host.initialize().toPromise();
+    });
 
     afterEach(() => host.restore().toPromise());
 
diff --git a/packages/angular/build/src/utils/worker-pool.ts b/packages/angular/build/src/utils/worker-pool.ts
index 3a4b3def27cb..78db4302ef1a 100644
--- a/packages/angular/build/src/utils/worker-pool.ts
+++ b/packages/angular/build/src/utils/worker-pool.ts
@@ -15,7 +15,7 @@ export class WorkerPool extends Piscina {
   constructor(options: WorkerPoolOptions) {
     const piscinaOptions: WorkerPoolOptions = {
       minThreads: 1,
-      idleTimeout: 1000,
+      idleTimeout: 4_000,
       // Web containers do not support transferable objects with receiveOnMessagePort which
       // is used when the Atomics based wait loop is enable.
       atomics: process.versions.webcontainer ? 'disabled' : 'sync',