Accepted answer

OK, I solved it.

The issue was with one of the components named MetaTags:


import React from 'react';
import { Helmet } from 'react-helmet';
import { timeUtils } from '../../../utils';

const MetaTags =
        <title data-rh="true">World Covid 19 Data | Covid 19 World Data | {timeUtils.getTitleDate()}</title>

export default MetaTags;

The react-helmet package is outdated, and I needed to install 'react-helmet-async' instead, and change the code to:


app = (
        <Suspense fallback={null}>
            <Provider store={createStore(rootReducer, composeEnhancers(applyMiddleware(thunk)))}>
                    <title data-rh="true">Dynamic title {timeUtils.getTitleDate()}</title>

This solved my issue and the warning was gone.

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