Repeater `saveRelationshipsUsing(null)` Not Hydrating Data Correctly

Repeater::make('spot_types')
  ->relationship('spotTypes')
  ->saveRelationshipsUsing(null)
  ->dehydrated()

public function handle(array $data, Model $record): Model
{
  $record->update($data);
  $record->spotTypes()->sync($data['spot_types']);

  return $record;
}