react-redux-spinner won't render - reactjs

Question

I was searching for a loading spinner for react+redux and came across the react-redux-spinner library. I included it in my project, added the reducer, called [pendingTask]: begin/end in my actions, added the Spinner component to render, but it just won't show at all, even though in the redux logs I can see that pending tasks in the store are incremented and decremented accordingly to the action called. Here is some of my code:
store:
const rootReducer = combineReducers({
pendingTasks: pendingTasksReducer
// other reducers
});
const store = createStore(rootReducer, /* middlewares */);
export default store;
actions
export const fetchData = params => {
const request = params => ({
type: 'FETCH_REQUEST',
[pendingTask]: begin,
payload: { params }
});
const success = data => ({
type: 'FETCH_SUCCESS',
[pendingTask]: end,
payload: { data }
});
const failure = error => ({
type: 'FETCH_FAILURE',
[pendingTask]: end,
payload: { error }
});
return async dispatch => {
dispatch(request(params));
try {
const res = await service.fetchData(params);
dispatch(success(res.data));
return res.data;
} catch (e) {
const msg = e.toString();
dispatch(failure(msg));
return Promise.reject(msg);
}
}
}
page
const Page = props => {
const { data } = props;
useEffect(() => {
async function fetchData(params) {
try {
await props.fetchData(params);
} catch (e) {
console.log(e);
}
}
fetchData(data.params);
}
return (
<div className="wrapper">
{
data.map(({ field1, field2 }, key) => ({
<div>{field1}: {field2}</div>
}));
}
</div>
);
};
const mapStateToProps = state => {
const { data } = state;
return { data };
};
const actionCreators = {
fetchData: actions.fetchData
};
export default connect(mapStateToProps, actionCreators)(Page);
app component
export const App = props => {
return (
<main className="App">
<Spinner config={{ trickeRate: 0.02 }} />
<Page/>
</main>
);
}
I've double-checked that I use the correct names for the store and for the actions, and they do fire up - but the spinner itself never gets rendered on the page at all, even though with each action the pendingTasks value change. What could I possibly do wrong or miss here? Infinitely grateful in advance for pointing out!