Laravel 8 pivot working only in 1 direction

I got a problem I have done model and migration for 3 tables: movies, actors and actor_movie (pivot)

when Im using from model Actor method movie() it working but don't work from Movie using actor()

class Movie extends Model
{
    use HasFactory;

    public function actors()
    {
        return $this->belongsToMany(Actor::class, 'actor_movie');
    }
}

class Actor extends Model
{
    use HasFactory;

    public function movies()
    {
        return $this->belongsToMany(Movie::class, 'actor_movie');
    }

}

movies migration:

public function up()
    {
        Schema::create('movies', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
        });
    }

actor migration:

public function up()
    {
        Schema::create('actors', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
        });
    }

Pivot migration:

public function up()
    {
        Schema::create('actor_movie', function (Blueprint $table) {
            $table->bigInteger('movie_id')->unsigned()->index();
            $table->foreign('movie_id')->references('id')->on('movies')->onDelete('cascade');
            $table->bigInteger('actor_id')->unsigned()->index();
            $table->foreign('actor_id')->references('id')->on('actors')->onDelete('cascade');
            $table->primary(['actor_id', 'movie_id']);
            $table->timestamps();
        });

    }