Eloquent with function BelongsToMany not working

[blpraveen]

• Laravel-mongodb Version: Latest
• PHP Version:7.4
• Database Driver & Version:
  Monogdb

Description:

           $this->getPermissionClass()->with('roles')->get()

My Model Permission is having this function

          public function roles(): BelongsToMany
          {
              return $this->belongsToMany(
                   config('permission.models.role'),
                   config('permission.collection_names.role_has_permissions'),
                    'permission_id',
                   'role_id'
             );
        }

it does not work
relation returns empty

namespace Illuminate\Database\Eloquent\Relations\BelongsToMany;

public function get($columns = ['*'])
{

    // First we'll add the proper select columns onto the query so it is run with
    // the proper columns. Then, we will get the results and hydrate our pivot
    // models with the result of those columns as a separate model relation.
    $builder = $this->query->applyScopes();

    $columns = $builder->getQuery()->columns ? [] : $columns;

    $models = $builder->addSelect(
        $this->shouldSelect($columns)
    )->getModels();

    $this->hydratePivotRelation($models);

    // If we actually found models we will also eager load any relationships that
    // have been specified as needing to be eager loaded. This will solve the
    // n + 1 query problem for the developer and also increase performance.
    if (count($models) > 0) {
        $models = $builder->eagerLoadRelations($models);
    }
    
    return $this->related->newCollection($models);
}

This function should return collection model of related but returns empty