Issue with validating Turnstile captcha on login only using Fortify and Laravel-Captcha; register works fine

To add more information, I went into the actual package files and DD'd out the response that's being returned from Cloudflare, and the response is success => true, so this is definitely an issue with my code or how Fortify is validating the $request parameters.

Even more information...

So I tried creating a Form Request but extending Fortify's LoginRequest class, but when I try and pass that in to the authenticateUsing() in the FortifyServiceProvider, it's saying that it must be a literal Fortify LoginRequest, not one that simply extends their class.

Error:

App\Providers\FortifyServiceProvider::App\Providers\{closure}(): Argument #1 ($request) must be of type App\Http\Requests\FortifyLoginRequest, Laravel\Fortify\Http\Requests\LoginRequest given

App\Http\Requests\FortifyLoginRequest:

<?php

namespace App\Http\Requests;

use Laravel\Fortify\Fortify;
use Laravel\Fortify\Http\Requests\LoginRequest;
use Rahul900day\Captcha\Facades\Captcha;

class FortifyLoginRequest extends LoginRequest
{
    public function authorize(): bool
    {
        return true;
    }

    public function rules(): array
    {
        return [
            Fortify::username() => ['required', 'string'],
            'password' => ['required', 'string'],
            Captcha::getResponseName() => ['required', 'captcha'],
        ];
    }
}

FortifyServiceProvider:

use App\Http\Requests\FortifyLoginRequest;

...

 		Fortify::authenticateUsing(function (FortifyLoginRequest $request) {
            $user = User::where('email', $request->email)->first();

            if ($user && Hash::check($request->password, $user->password)) {
                return $user;
            }
        });

Ok, now I am extremely confused.

As a test, I added the Captcha::getResponseName() => ['required', 'captcha'] validator to the rules() array of the Fortify package's own LoginRequest class, and it worked.

#1: Why?

#2: This is obviously not good since those changes won't make it to my site since they're being made in the /vendor folder, so how do I make a validator that works with Fortify and that can correctly validate those captchas?

Ok, so thanks to the Laravel Discord, someone suggest that I bind my request class to the container as part of the FortifyServiceProvider. Once I did that, I was able to correctly use my own FortifyLoginRequest class that extended Fortify's LoginRequest. Now I can use the validator provided in the laravel-captcha package to validate the Cloudflare Turnstile captchas when someone tries to login.

FortifyServiceProvider.php

<?php

namespace App\Providers;

use App\Actions\Fortify\CreateNewUser;
use App\Actions\Fortify\ResetUserPassword;
use App\Actions\Fortify\UpdateUserPassword;
use App\Actions\Fortify\UpdateUserProfileInformation;
use App\Http\Requests\FortifyLoginRequest;
use App\Models\User;
use Illuminate\Support\Facades\Hash;
use Illuminate\Cache\RateLimiting\Limit;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\RateLimiter;
use Illuminate\Support\ServiceProvider;
use Laravel\Fortify\Fortify;
use Laravel\Fortify\Http\Requests\LoginRequest;

class FortifyServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register(): void
    {
        $this->app->bind(LoginRequest::class, FortifyLoginRequest::class);    // <- I did this
    }

    /**
     * Bootstrap any application services.
     */
    public function boot(): void
    {
        <snip>

        Fortify::authenticateUsing(function (FortifyLoginRequest $request) {     // <- so I could do this
            $user = User::where('email', $request->email)->first();

            if ($user && Hash::check($request->password, $user->password)) {
                return $user;
            }
        });

        <snip>
    }
}

FortifyLoginRequest.php

<?php

namespace App\Http\Requests;

use Laravel\Fortify\Fortify;
use Laravel\Fortify\Http\Requests\LoginRequest;
use Rahul900day\Captcha\Facades\Captcha;

class FortifyLoginRequest extends LoginRequest
{
    public function authorize(): bool
    {
        return true;
    }

    /** @phpstan-ignore-next-line */
    public function rules(): array
    {
        return [
            Fortify::username() => ['required', 'string'],
            'password' => ['required', 'string'],
            Captcha::getResponseName() => ['required', 'captcha'],
        ];
    }
}