Nested wherehas closure function not working correctly

need help with this nested closure function as it is not working perfectly. This chunk of code is part of a bigger sql query , and problem lies in this part only any help will be appreciated

  $browse_verticals = $browse_verticals->distinct()->with("verticals")->with([
                    "document_types" => $closure = function ($query) use ($document_array, $key) {
                        $query->whereIn('document_type_id', $document_array);
                        if ($key != "") {
			//problem is here it is working  fine for above statement but not for this key .
                            $query->whereHas(
                                'titles',
                                function ($query) use ($key) {
                                    $query->orwhere("title", 'LIKE', '%' . $key . '%');
                                }
                            );
                        }
                    }
                ])->whereHas('document_types', $closure)->distinct();