Why jest.spyOn doesn't invalidate module cache when requiring single function?

Question

I have

// mod1.js
const f = (_n) => console.info('a:', _n) || _n * 2
module.exports = { f }

// mod2.js
const { f } = require('./mod1')
const g = (_n) => 3 * f(_n)
module.exports = { g }

and a test file

describe('mod2', () => {
    it('should check 1', () => {
        const { g } = require('../src/mod2')
        expect(g(2)).toEqual(12)
    })

    it('should check 2', () => {
        const mod1 = require('../src/mod1')
        jest.spyOn(mod1, 'f').mockImplementation(_n => _n * 4)
        const { g } = require('../src/mod2')
        expect(g(2)).toEqual(24)
    })

    it('should check 3', () => {
        const mod1 = require('../src/mod1')
        jest.spyOn(mod1, 'f').mockImplementation(_n => _n * 5)
        const { g } = require('../src/mod2')
        expect(g(2)).toEqual(30)
    })
})

Well, second and third test fail because apparently the original function (loaded by the first test) is used.

If I have

// mod2.js
const mod1 = require('./mod1')
const g = (_n) => 3 * mod1.f(_n)
module.exports = { g }

all is good!

You can check this repo: https://github.com/oliviera9/test-jest-require-cache