JS Morisset

Is Google Search reporting invalid Schema markup from your theme templates?
Do you need to remove old Microdata and RDFa markup from your theme templates?
Do you need to remove duplicate social or SEO meta tags from your webpage?

By default, the WPSSO Strip Schema Microdata (WPSSO SSM) add-on can remove old Schema Microdata and RDFa markup from the webpage. The settings page also allows for the optional removal of duplicate / conflicting Schema markup and meta tags from the webpage head or body sections.
WPSSO SSM filters the webpage dynamically, allowing you to activate or deactivate the add-on to enable or disable the removal of old Schema Microdata, RDFa, and duplicate meta tags. The WPSSO SSM webpage filter is very fast – generally running in under 0.003 seconds.

<h3>WPSSO Core Required</h3>
WPSSO Strip Schema Microdata is an add-on for the <a href="https://wordpress.org/plugins/wpsso/" rel="ugc">WPSSO Core plugin</a>, which creates extensive and complete structured data to present your content at its best for social sites and search results – no matter how URLs are shared, reshared, messaged, posted, embedded, or crawled.

WPSSO Strip Schema Microdata

Remove Schema Microdata and RDFa from the webpage for better Google Rich Results using Schema JSON-LD markup.

Ecwid by Lightspeed Ecommerce Shopping Cart

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.

WPSSO Strip Schema Microdata vs Protect schema.org markup in HTML editor