CompleteVarDocTypePropertyRector overrides comments

[clxmstaab]

Subject	Details
Rector version	v0.5.20
PHP version	PHP 7.2.9
Full Command	rector process models --set php70

rector.yml

parameters:
  auto_import_names: true
  php_version_features: '7.0'
  autoload_paths:
    - 'phpstan-bootstrap.php'
services:
  Rector\TypeDeclaration\Rector\Property\CompleteVarDocTypePropertyRector: ~

Expected

type should be changed but no comment overridden

Actual

existing docs get overriden