Custom exception handler for API is not working

I'm having problems catching Exceptions in my Laravel/Sanctum/ SPA/API that uses Cahsier. I can catch Stripe exceptions in the handler method, but can't catch NotFoundHttpException.

In my controller I'm deliberately setting a query parameter that I know will fail to test the exception:

Controller

public function processCheckout(Request $request)
{    
    
    $plan = Plan::findOrFail(100);
    $user = $user = auth()->user();
    
    //If user has no subscriptions subscribe them to new plan
    if($user->subscriptions->count() === 0){
        $user->newSubscription($plan->name, $plan->stripe_plan_id)->create($request->payment_method['id']);

        //return response([], 201);
    }
}

When I turn on: APP_DEBUG=true I get this response:

{
    "message": "No query results for model [App\Plan] 100",
    "exception": "Symfony\Component\HttpKernel\Exception\NotFoundHttpException",
    "file": "/Applications/MAMP/htdocs/saas-spa/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php",
    "line": 222,
    "trace": [
        {
            "file": "/Applications/MAMP/htdocs/saas-spa/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php",
            "line": 198,
            "function": "prepareException",
            "class": "Illuminate\Foundation\Exceptions\Handler",
            "type": "->"
        },
        {
            "file": "/Applications/MAMP/htdocs/saas-spa/app/Exceptions/Handler.php",
            "line": 85,
            "function": "render",
            "class": "Illuminate\Foundation\Exceptions\Handler",
            "type": "->"
        }, // and more
	]
}

When I turn APP_DEBUG=false I get nothing as a response.

app/Exceptions/Handler.php

public function render($request, Throwable $exception)
{
    if ($exception instanceof \Stripe\Exception\ApiErrorException) {
        return response()->json([
            'code' => $exception->getCode(),
            'message' => $exception->getMessage(),
        ]);
    }
    $response = $this->handleException($request, $exception);
    return $response;
}

public function handleException($request, Throwable $exception)
{

    if ($exception instanceof MethodNotAllowedHttpException) {
        return $this->errorResponse('The specified method for the request is invalid', 405);
    }

    if ($exception instanceof NotFoundHttpException) {
        return $this->errorResponse('The specified URL cannot be found', 404);
    }

    if ($exception instanceof HttpException) {
        return $this->errorResponse($exception->getMessage(), $exception->getStatusCode());
    }

    if (config('app.debug')) {
        return parent::render($request, $exception);            
    }
    return $this->errorResponse('Unexpected Exception. Try later', 500);

}

Why am I not able to output my custom error message?