After "Saving&publishing" of an edited article in the "Edit article" mode some text blocks are missing (replacing) and the order of the blocks is changed.

Steps to reproduce

1. First, create an article with a few paragraphs and publish it. I just made paragraphs containing '1', '2', '3', etc, so you can keep track of them easily.
2. Then, set your cursor at the beginning of a paragraph and hit "Enter" key
3. Add some text to the new block. I added one after the '1' paragraph, with the text containing '1a'
4. After saving and publishing, paragraph"1a" showed but "2" had disappeared. After refreshing the article in Magnolia, it was also gone from there

Steps to reproduce with the pictures: here in the comment

And here is my testing video: article-blocks_sorting-replacing.webm