`vi.spyOn` behavior regressed after upgrading Vitest (3.1.1 → 3.2.4)

[simeng-li]

Describe the bug

After upgrading Vitest from 3.1.1 to 3.2.4, tests that rely on top-level vi.spyOn + vi.clearAllMocks() start failing.

This setup worked in 3.1.1. After upgrading, call-count assertions consistently fail, implying the spy stops collecting calls once clearAllMocks runs. There’s no mention of this behavioral change in the release notes.

Need some help clarifying the expected behavior and best practices.

Reproduction

1. const funcSpy = vi.spyOn(queries, 'getXXX') defined at module scope.
2. beforeEach(() => vi.clearAllMocks())
3. Tests that assert expect(funcSpy).toHaveBeenCalledTimes(1) or .toHaveBeenValledWith(...) start fail. Calls not tracked.
4. However, the mocked return values from funcSpy.mockReturnedValueOnce still work as expected for each test case.

System Info

System:
    OS: macOS 26.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 76.73 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.14.0 - /Users/simengli/.nvm/versions/node/v22.14.0/bin/node
    npm: 10.9.2 - /Users/simengli/.nvm/versions/node/v22.14.0/bin/npm
    pnpm: 10.18.2 - /Users/simengli/Library/pnpm/pnpm
  Browsers:
    Chrome: 142.0.7444.176
    Safari: 26.1
  npmPackages:
    vitest: ^3.2.4 => 3.2.4

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[hi-ogawa]

Do you mean the same behavior exists in latest v4.0.15?

[simeng-li]

No, haven't tried v4.0.15 yet. Since that is a major release, it might contain other breaking changes. Just the latest 3.x.x.

[github-actions]

Hello @simeng-li. Please provide a minimal reproduction using a GitHub repository or StackBlitz (you can also use examples). Issues marked with needs reproduction will be closed if they have no activity within 3 days.

[hi-ogawa]

Would appreciate a self contained reproduction to understand the issue properly.