Paragraph alignment is lost when the design is rendered through ez_render_field method

steps to reproduce

. in an eZ Publish 5.1, with Demo design
. configure an override template such as the example

            location_view:
                full:
                    smallFolder:
                        template: eZDemoBundle:full:small_folder.html.twig
                        match:
                            Identifier\ContentType: folder
                            Identifier\ParentContentType: [landing_page, frontpage]

. create a folder and place some paragraphs right, center and left aligned, using the eZOE buttons, in description field
. Access the folder in the front end and verify that the alignment options is not present