Full Post Style broken in Version 7.6.9

If you use latest post with full content, in the previous version of newsletter plugin (before Version 7.6.9), the gutenberg blocks are rendered with

<p class="paragraph" style="font-size: 16px;font-family: Verdana, Geneva, sans-serif;font-weight: normal;color: #222222; line-height: 1.5em!important; text-align: left;"><!-- wp:paragraph --></p>

In Version 7.6.9, now they are created with

<p inline-class="p"><!-- wp:paragraph --></p>

This breaks the layout of the post, it’s centering the text (because of the align=”center” td tag in higher dom) and the font-size is smaller than before!