get_the_content_feed with paginated posts

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If you are talking about paginated posts which created using <!--nextpage--> tag, then you will have to use the_content_feed hook to strip that tag and pass the full content. I have tried below code & it does exactly that. But please note it will pass full content to RSS feed for all the posts.

add_action('the_content_feed', 'strip_nextpage_tag_for_rss');
function strip_nextpage_tag_for_rss() {
global $post;
$content = apply_filters('the_content', $post->post_content);
$content = str_replace( "\n<!--nextpage-->\n", '', $content );
$content = str_replace( "\n<!--nextpage-->", '', $content );
$content = str_replace( "<!--nextpage-->\n", '', $content );
$content = str_replace( "&lt;!--nextpage--&gt;", '', $content );
$content = str_replace( "<p>&lt;!&#8211;nextpage&#8211;&gt;</p>", '', $content );
$content = str_replace( "<p><!--nextpage--></p>", '', $content );
return $content;
}

Place above code in your theme’s functions.php file. I hope this helps.