Laravel: how to use softDelete on common polymorph model

I have a table of Items with softDelete enabled:

class Item extends Model
{
  use SoftDeletes;

  protected $hidden = [
      'extendable_type', 'extendable_id'
  ];

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

and several classes that share a relationship with the Items via traits:

trait IsItemModel
{

  public function item()
  {
      return $this->morphOne('App\Models\Item', 'extendable')->withDefault();
  }

and

class FileItem implements ItemInterface
{
  use IsItem;
  ...
  public static function delete(Request $request)
  {
    $file = self::$model::deletable()->find($request->itemId);
    $file->delete();
    return true;
  }

However, the call to $file->delete() always just hard-deletes the row in the file_items table, instead of setting deleted_at in the common items table.

I could just apply softDelete to each individual model, but that seems wrong somehow. Is there any way to do this so the softDelete functionality is shared by the polymorphic relationship?

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