For a full explanation of the issue, check out Justin Tadlock’s article.
You can either install the Remove WordPress to WordPress Filter plugin or add the below code to your theme’s functions.php file.
remove_filter( 'the_content', 'capital_P_dangit' );
remove_filter( 'the_title', 'capital_P_dangit' );
remove_filter( 'comment_text', 'capital_P_dangit' );
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