Plugins prefixes and routes confusion

Need Help
1

I was busy making a plugin and got confused about the router and prefix system. And the consistency of using uppercase and lowercase to reach the actual paths.

<?php
use Cake\Routing\Route\DashedRoute;

$routes->plugin(
    'Myplugin',
    ['path' => '/Myplugin'],
    function ($routes) {
        $routes->setRouteClass(DashedRoute::class);
    }
);

$routes->prefix('Admin', function ($routes) {
    $routes->plugin(
        'Myplugin',
        ['path' => '/Myplugin'],
        function ($routes) {
            $routes->fallbacks('InflectedRoute');
        });
});

when go to url http://localhost/Myplugin/somecontroller It show error missing need to use http://localhost/myplugin/somecontroller can reach

when go to url http://localhost/admin/myplugin/somecontroller can not reach, need to use http://localhost/admin/Myplugin/somecontroller

Is this the difference between fallbacks Inflicted route and dashedroutes that the case sensitive is different?