Laravel : errors is not showing

I am using resource in laravel and i wanna a custom uri route for (show) action my route is:

Route::resource('/admin/users', 'UsersController')->except(['show']);
Route::get('/admin/users/{user}/show', 'UsersController@show')->name('users.show');

i checking a test url but not showing Error 404 in this Route for example :

http://127.0.0.1:8000/admin/users/test

show this error

The GET method is not supported for this route. Supported methods: PUT, PATCH, DELETE.

When I delete the code except(['show']) My code is working properly and shows a 404 error but my Route List Show Two Route for show action

|        | GET|HEAD  | backend/users/{user}      | backend.users.show 
|        | GET|HEAD  | backend/users/{user}/show | backend.users.show 

I found the solution to this problem

Edit this file :

/app/Exceptions/Handler.php

Add this line

use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;

And

public function render($request, Throwable $exception)
{
if ($exception instanceof MethodNotAllowedHttpException) 
         {
        abort(404);
         }
         return parent::render($request, $exception);
}