When you create an object and, without publishing it, you add several paragraphs of text into an XML Block attribute, it is possible to select all paragraphs and change their alignment. However, once the object is published and edited, that is no longer possible. One has to select the paragraphs one by one in order to modify their alignment.

Steps to reproduce

1. Create a new article, and insert several paragraphs on 'body', for example;
2. Before the article is published, it is possible to select multiple paragraphs and then change their alignment;
3. Publish the article and edit it;
4. Select multiple paragraphs on the 'body' field. It should be possible to modify the paragraphs' alignment, but it's not.