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In an extension to ongoing changes in order to 'simplify' the search results, Google have now removed the How-To rich result for users on mobile devices (it will still be shown for desktop users). Note that with mobile indexing, Google indexes the mobile version of a website as the basis for indexing: to have How-To rich results shown on desktop, the mobile version of your website must include the appropriate markup.
Google have removed description from their list of recommended properties, stating that it is "unused by Google Search" and that the Rich Result Test doesn't flag warnings for it.