diff --git a/packages/app/src/cli/models/app/app.test.ts b/packages/app/src/cli/models/app/app.test.ts
index 954c5a22159..18c071ff861 100644
--- a/packages/app/src/cli/models/app/app.test.ts
+++ b/packages/app/src/cli/models/app/app.test.ts
@@ -851,3 +851,21 @@ function createPackageJson(tmpDir: string, type: string, version: string) {
   const dirPath = joinPath(tmpDir, 'node_modules', '@shopify', type)
   return mkdir(dirPath).then(() => writeFile(packagePath, JSON.stringify(packageJson)))
 }
+
+describe('preDeployValidation awaiting', () => {
+  test('awaits extension validation and catches rejections', async () => {
+    // Given
+    const extension = await testUIExtension()
+    vi.spyOn(extension, 'preDeployValidation').mockImplementation(async () => {
+      await new Promise((resolve) => setTimeout(resolve, 10))
+      throw new Error('Validation failed')
+    })
+
+    const app = testApp({
+      allExtensions: [extension],
+    })
+
+    // When / Then
+    await expect(app.preDeployValidation()).rejects.toThrow('Validation failed')
+  })
+})
diff --git a/packages/app/src/cli/models/app/app.ts b/packages/app/src/cli/models/app/app.ts
index df707939e2b..3bf2b55b38b 100644
--- a/packages/app/src/cli/models/app/app.ts
+++ b/packages/app/src/cli/models/app/app.ts
@@ -405,7 +405,7 @@ export class App<
       }
     }
 
-    await Promise.all([this.allExtensions.map((ext) => ext.preDeployValidation())])
+    await Promise.all(this.allExtensions.map((ext) => ext.preDeployValidation()))
   }
 
   extensionsForType(specification: {identifier: string; externalIdentifier: string}): ExtensionInstance[] {