Laravel9: route parameter always missing in validation

I am using Laravel v9.2.1

I got a route

DELETE /api/v1/auth/tokens/{token}

for example (the token is an uuid)

DELETE http://example.com/api/v1/auth/tokens/5fcfa274-81d8-4e9f-8feb-207db77531af

And I am sure it works as expected via php artisan route:list
enter image description here

Before handling by the Controller, it should be validated by a FormRequest

app/Http/Controllers/V1/Auth/TokensController.php

namespace AppHttpControllersV1Auth;

use AppHttpRequestsV1AuthTokens{
    DestroyRequest,
};

class TokensController extends Controller
{
    public function destroy(DestroyRequest $request) {
        $request->user()->tokens()->where('id', $request->token)->first()->delete();
        return response()->noContent();
    }
}

app/Http/Requests/V1/Auth/Tokens/DestroyRequest.php

class DestroyRequest extends FormRequest
{
    public function rules()
    {
        return [
            'token' => [
                'required',
                'string',
                'regex:/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i', 
                Rule::exists('personal_access_tokens')->where(function ($query) {
                    return $query->where('tokenable_id', $this->user()->id);
                }),                         
            ]
        ];
    }
}

But what I only got is The token field is required

I had already pass the token, why the 'required' rule still working?

enter image description here

What I tried

Only if I pass the token parameter like below, it will work

DELETE /api/auth/tokens/something?token=test_regex_is_working

enter image description here

I try to dd($this->token) in app/Http/Requests/V1/Auth/Tokens/DestroyRequest.php, it works as expected.

enter image description here