Sort values not generated on MorphPivot table

[kuchienkz]

I'm trying to use this package on a MorphPivot model, but it's not working, no errors while debugging, it just does not generate the sort/order values. Am I missing something?

Here is the model:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\MorphPivot;
use Spatie\EloquentSortable\Sortable;
use Spatie\EloquentSortable\SortableTrait;

class Groupables extends MorphPivot implements Sortable
{
    use SortableTrait;

    public $sortable = [
        'order_column_name' => 'sort',
        'sort_when_creating' => true,
    ];

    public function buildSortQuery()
    {
        return static::query()
        ->where('group_id', $this->group_id)
        ->where('groupable_type', $this->groupable_type);
    }
}