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WordPress HTML editor (tinyMCE) treats schema.org attributes like itemscope/itemtype/itemprop as invalid HTML attributes and strips them when you save the post or page content. This plugin alters this behavior and prevent the WordPress HTML editor from removing the schema.org/microdata markup.
<h3>Credits</h3>
@azaozz suggested the solution. See the issue discussion here: https://core.trac.wordpress.org/ticket/27931

Protect schema.org markup in HTML editor

Easy tool to stop HTML editor from removing schema.org/microdata tags from post or page content.

vancho17

This simple plugin allows you to enhance custom fields with TinyMCE allowing your clients to add rich text content to any area of your site.
Features
<ul>
<li>Automatically upgrades textareas in custom fields to TinyMCE.</li>
</ul>

mceTextarea

This simple plugin allows you to enhance custom fields with TinyMCE allowing your clients to add rich text content to any area of your site.

Protect schema.org markup in HTML editor vs mceTextarea