Syntax No Longer Shows in RSS Feed

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I don’t know if it just started with WP 4.8 but the syntax no longer appears in the RSS feed. Blog: http://blog.markheadrick.com/

The RSS Feed just has this now for the first post:

<pre lang="css">.mce-content-body p, p {
	line-height: 1.714285714 !important;
}</pre>

The blog itself has all the inline CSS to color code it.