having problem to set different subdomain for web route and api routes

[moinologics]

What i need - let suppose i had a domain example.com pointing to my laravel app's public directory. i can access my web with example.com & api with example.com/api. but what i need to make a seprate subdomain for api like api.example.com

what i try -

in app/providers/RouteServiceProvider.php 's boot() method, i put

  Route::domain(env('API_DOMAIN'))
                ->middleware('api')
                ->namespace($this->namespace)
                ->group(base_path('routes/api.php')); 

where API_DOMAIN=api.example.com in .env file.

in routes/api.php 's end of file, i put

Route::fallback(function(){
    return response()->json(['status' => 404, 'message' => 'Not Found.'], 404);
});

what problem i facing - i working fine for api.example.com for those routes which i defined inside routes/api.php but when a route didn't found in api.php & also not in routes/web.php the fallback route inside api.php runs and thats ok, but when route not find inside api.php but exists inside web.php than even when doamin is api.example.php, the routes called from web.php which is not good.

what i want now - when a url hit from api.example.com than no route must run from web.php , when a url hit from example.com than only web.php routes must be consider.

laravel version - 8.4