Update product problem laravel / livewire

Hi Folks, I'm trying to update a product without the need to redo the uploads again, of course if necessary be able to upload a new image, but for some reason I'm getting The state.product image field must be an image. The state.product image field must be a file of type: jpg, png., even though the field is set to null at creation, even without an image it works fine, but in the update I am facing this problem. Can anybody help me? Thank you in advance for all help welcome.

Follow the code.

class EditProduct extends Component { use WithFileUploads;

public Product $product;

public $uploads = [];

public $files = [];

public $existingFiles = [];

public $removedFiles = [];

public $state = [
    'title' => null,
    'slug' => null,
    'description' => null,
    'price' => '0.00',
    'live' => false,
    'product_image' => null, 
    'files.*' => null,
];

public function rules()
{
    return [
        'state.title' => 'required|max:255',
        'state.slug' => 'required|max:255|unique:products,slug,' . $this->product->id,
        'state.description' => 'required',
        'state.price' => 'required|decimal:0,2|min:1',
        'state.live' => 'boolean',
        'state.product_image' => 'nullable|image|mimes:jpg,png|max:2048',
        'files.*' => 'required|mimes:zip|max:98048',
    ];
}

public function mount()
{
    $this->state = $this->product->withoutRelations()->toArray();
    $this->state['price'] = money($this->state['price']['amount'])->formatByDecimal();
    $this->existingFiles = $this->product->files;

 
}

public function submit()
{
    $this->validate();
    if ($this->state['product_image']) {
        $imagePath = $this->state['product_image']->store('public/product_image');
        $this->state['product_image'] = Storage::url($imagePath);
    } else {
        unset($this->state['product_image']);
    }
    $this->product->update($this->state);

    $files = collect($this->files)->map(function ($file) {
        return File::make([
            'filename' => $file->getClientOriginalName(),
            'path' => $file->store('files')
        ]);
    });

  

    $this->product->files()->saveMany($files);

    $this->product->files()->whereIn('id', $this->removedFiles)->delete();

    $this->dispatchBrowserEvent('alert', 'Product updated!');
}