Impossible to override input received on `onInputValueChange` after item selection

- `downshift` version: 3.2.10
- `node` version: 10.15.3
- `yarn` version: 1.17.3

**Relevant code or config**

```javascript
const stateReducer = (state, changes) => {
switch (changes.type) {
case Downshift.stateChangeTypes.clickItem:
case Downshift.stateChangeTypes.keyDownEnter:
case Downshift.stateChangeTypes.controlledPropUpdatedSelectedItem:
return {
...changes,
inputValue: "input overriden"
};
default:
return changes;
}
};
```

**What you did**:

I tried to override via `stateRducer` the `inputValue` **after some item is selected**.

**What happened**:

The internal state gets updated, but then I receive from `onInputValueChange` the selected item string, instead of the `inputValue` in state.

**Reproduction repository**:

It is the basic autocomplete with minimum modifications and some explanations:
[Codesandbox](https://codesandbox.io/s/hardcore-goldwasser-2ugu4)

**Problem description**:

I can't get the `inputValue` that I have overridden via `stateReducer` from `onInputValueChange` after an item is selected. I always get the selected item string instead. This behaviour seems to be unexpected.

**Suggested solution**:

I have no suggestion yet! Can you confirm this is an unexpected behaviour?