Cannot perform 'get' on a proxy that has been revoked (When testing reducer with Jest)

If you have a reducer that uses an util function and you wan’t to mock and check the call of the function the test will break:

const { reducer, actions } = createSlice({
  name: 'aSlice',
  reducers: {
    doSomething(state, action) {
      someUtilFunc(state, action.payload)
    }
  }

test('reducer should call someUtilFunc with state and payload on action doSomething', () => {
  const myPayload = { name: 'foo' }
  
  const state = { name: 'bar' }
  
  reducer(state, actions.doSomething(myPayload))
  
  expect(someUtilFunc).toHaveBeenCalledWith(state, myPayload)
})

expect(someUtilFunc).toHaveBeenCalledWith(state, myPayload) this line will throw a Cannot perform 'get' on a proxy that has been revoked error.

I’m guessing this is because immerJs proxy is revoked when the reducer call is completed. I could pass {...state} to my someUtilFunc but this is impractical and I don’t wan’t my tests to influence my code.