Other Routes doesn't appear at the page when having multiple Provider

 #react-router-dom

 why the Blog & Contact doesn't appear

 <Switch>
    <AProvider>
        <Route exact path="/" component={Home} />
        <Route exact path="/about" component={About} />
    </AProvider>

    <BProvider>
        <Route exact path="/blog" component={Blog} />
        <Route exact path="/contact" component={Contact} />
        <Route component={NotPage} />
     </BProvider>
</Switch>