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.
Credits
@azaozz suggested the solution. See the issue discussion here: https://core.trac.wordpress.org/ticket/27931
Download & install the zip archive
The plugin package installer can be downloaded from the WP2E project tab called “code”.
1 – Select the version to download if this option is available otherwise the “latest” version of the main plugin will be used.
2 – After downloading the zip archive install the plugin package installer in you local environment and activate the script from the plugin list.
3 – Under the section “Plugins” of the admin dashboard you should see a new “Dependencies & Licenses” link. Follow the instructions from this panel to finalize the installation of the missing dependencies.
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- Give a name to your project
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- Download the Installer Package
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- Install & activate the plugin locally
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- Install the suggested dependencies
Tips: Use the WP2E panel to add/suggest new dependencies to the local installation. Press F5 in the list of dependencies if the changes are not displayed right away.