No query results for model [App\Thread] favorites

I have a thread where I can favorite the thread so I created a polymorphic relationship between the two of them(as replies of a thread also can be favorited).

I wrote a post and delete request for the thread in my vue:

methods: {
        toggle(){
            // check if thread is favorited
            if(this.isFavorited){
               
                axios.delete('/threads/' + this.thread.id + '/favorites').catch(function (error) {
                 if (error.response) {
                 // Request made and server responded
                 console.log(error.response.data);
                 console.log(error.response.status);
                console.log(error.response.headers);
                 } else if (error.request) {
                 // The request was made but no response was received
                console.log(error.request);
                 } else {
               // Something happened in setting up the request that triggered an Error
                  console.log('Error', error.message);
                 }});
                this.isFavorited = false;
                this.count--;
            }else{
                console.log('/threads/'+this.thread.id+'/favorites');
                axios.post('/threads/'+this.thread.id+'/favorites');
                this.isFavorited = true;
                this.count++;
            }
        }
    }  

And my routes in web.php:

//Post favourite to a thread
Route::post('/threads/{thread}/favorites','FavoritesController@storeThreads');

//Delete a favourited thread
Route::delete('/threads/{thread}/favorites','FavoritesController@destroyThreads');

in my controller:

  public function storeThreads(Thread $thread){
        $thread->favorite();
        return back();
    }

    public function destroyThreads(Thread $thread){
        $thread->unfavorite();
    }

and in my Thread model:

 public function favorites(){
        return $this->morphMany('App\Favorite','favorited');
    }

    public function favorite(){

        $attributes = ['user_id'=>auth()->id()];
        if(! $this->favorites()->where($attributes)->exists()){
            return $this->favorites()->create($attributes);
        }
    }
    public function unfavorite(){
        $attributes = ['user_id'=>auth()->id()];
        if($this->favorites()->where($attributes)->exists()){
            return $this->favorites()->where($attributes)->delete();
        }
    }

    public function isFavorited(){

        return  $this->favorites->where('user_id',auth()->id())->count();
    }

    public function getIsFavoritedAttribute(){
        return $this->isFavorited();
    }

    public function getFavoritesCountAttribute(){
        return $this->favorites->count();
    }

my Favourite model:

class Favorite extends Model
{
    use RecordsActivity;

    protected $guarded =[];

    public function favorited(){
        return $this->morphTo(); 
    }
}

So when I send the post request to favorite the thread, it works as expected but when I unfavorite it, it does not delete the data from the db and says:

DELETE http://forum.test/threads/25/favorites 404 (Not Found)
No query results for model [App\Thread] favorites

From this error, it's clearly referring that it could not find the query for thread id=25. I checked my route:list and there is a delete route. I also checked my threads table and there is id 25 as well as favorites table as well.

Reference:

https://ibb.co/KKQVJTX (threads table)

https://ibb.co/NNLvpXK (favorites table)

I tried using php artisan tinker to delete it and it works though so I don't know what am I missing.

I am out of idea on how to fix this issue or I may have overlooked something. How do I solve this?