Laravel livewire not seeing render update after attach

Question

I have a livewire component rendering two lists on a page. I have a button on the left list to add that item to the right list (many to many) relation using attach. This is working, but the right list isn't getting re-rendered. When I then click a filter I have on the left list, the right list re-renders showing the newly attached item. It seems like either render() isn't being called when I do the attach method, or it is taking another call to render to pick up the new relation? I also tried calling $this->render from the attach method, but that didn't help.

public function render()
    {
        $items = item::with('status')
            ->where(function($query){
                $query->when(!empty($this->selectedStati), function ($query) {
                    $query->whereHas('status', function ($query) {
                        $query->whereIn('id', $this->selectedStati);
                    })->orWhereDoesntHave('status');
                });
            })
            ->get();

        $testItems = $this->test->items;
       //dd($testItems);
        return view('livewire.items-source', [
            'selectedStati' => $this->selectedStati,
            'statuses' => $this->status,
            'items' => $items,
            'testItems' => $testItems
    ]);
    }

    public function filterStatus($id){
        if (($key = array_search($id, $this->selectedStati)) !== false) {
            unset($this->selectedStati[$key]);
        } else {
            $this->selectedStati[]=$id;
        }
        session(['status'=>$this->selectedStati]);
    }

    public function addToTest($id){
        //attach the given item to the test
        $this->test->items()->attach($id);
        dd($this->test->items);
    }

    public function removeFromTest($id){
        //detach the given item from the test
        $this->test->items()->detach($id);
        
    }

Answer 1

after attach the item to test collection refresh model to rehydrate it with fresh data like

public function addToTest($id){
   //attach the given item to the test
   $this->test->items()->attach($id);
   $this->test->refresh();
}