1. Visit packages\app\screens\device\modals\delete.stories.tsx notice the useRouter mock is commented out.

2. Visit packages\app\utils\hooks\useRouter.mock.ts notice the export calls mockReturnValue

3. Launch SB, view the story without error.

4. Change the import of fn from @vitest/spy to @storybook/test

5. Notice the story with error Cannot read properties of undefined (reading 'replace')

This behaviour should not differ in my opinion. To get no error with @storybook/test add the mockReturnValue call in packages\app\screens\device\modals\delete.stories.tsx