The custom messages doesn't returned from FormRequest in my app based on Laravel 9.8.1

Question

Next is my FormRequest:

    <?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class StoreFruitRequest extends FormRequest
{
/**
 * Determine if the user is authorized to make this request.
 *
 * @return bool
 */
public function authorize()
{
    return true;
}

/**
 * Get the validation rules that apply to the request.
 *
 * @return array
 */
public function rules()
{
    return [
        'name' => 'required|string|min:3',
        'carbohydrates' => 'required|numeric|gte:0',
        'protein' => 'required|numeric|gte:0',
        'fat' => 'required|numeric|gte:0',
        'calories' => 'required|integer|numeric|gte:0',
        'sugar' => 'required|numeric|gte:0',
    ];
}

/**
 * Error Messages
 *
 * @return array
 */
public function messages() :array
{
    return [
        'carbohydrates.gte' => 'Nutrients cannot be negative',
        'protein.gte' => 'Nutrients cannot be negative',
        'fat.gte' => 'Nutrients cannot be negative',
        'calories.gte' => 'Nutrients cannot be negative',
        'sugar.gte' => 'Nutrients cannot be negative',
    ];
}
}

The validation rules work fine but when I make the request with the wrong value, which is a negative amount, validation does not return these messages to the controller. So, my API returns the main blade page as an error.

What is incorrect in my code? Or, do I need some tunings anywhere?

Controller (as an answer for @NickSdot):

/**
 * Store a newly created resource in storage.
 *
 * @param StoreFruitRequest $request
 * @return JsonResponse
 */
public function store(StoreFruitRequest $request)
{
    return response()->json(Fruit::create($request->all()) ?? "Cannot create fruit $request->name");
}