Why PATCH Method Fails While POST Method Works in Laravel?

I am encountering an issue when sending a PATCH request in my Laravel application. When sending a PATCH request to update a resource, I am not getting the expected result. However, when I send the same request using the POST method, I get the desired result. What could be the issue with the PATCH request?

// web
Route::patch('{id}/update', [UrunlerController::class, 'update'])->name('magaza.urun.guncelle.submit');

// Controller
    public function update(Request $request, string $id)
    {
        $sayi = $request->input('sayi');

        return response()->json([
            'success' => true,
            'sayi' => $sayi
        ]);
    }

// vanilla js
document.getElementById('patates').addEventListener('click', function() {
    var formData = new FormData();
    formData.append('sayi', 123); // Basit veri ekliyoruz

    var url = `{{ route('magaza.urun.guncelle.submit', ['id' => 8]) }}`; 

    fetch(url, {
        method: 'PATCH',
        headers: {
            'X-CSRF-TOKEN': '{{ csrf_token() }}'
        },
        body: formData 
    })
    .then(response => response.json())
    .then(data => {
        console.log(data);
    })
    .catch(error => {
        console.error('Hata:', error);
    });
});

The result I expected

{
    "success": true,
    "sayi": "123"
}

The result I encountered

{
    "success": true,
    "sayi": null
}

Laravel v:11.20.0