This seems to do the trick:
add_filter( 'next_post_link', 'wpse_post_link', 10, 4 );
add_filter( 'previous_post_link', 'wpse_post_link', 10, 4 );
function wpse_post_link( $output, $format, $link, $post )
{
if( $url = get_permalink( $post ) )
$output = str_replace( $url, $url . '#anchor', $output );
return $output;
}
i.e. appending the #anchor
to the previous/next permalinks.
ps: I removed the WP_Rewrite::using_permalink()
check, since we actually don’t need it, example.tld?p=123#anchor
should work as well.
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