Template for custom taxonomy for custom post type broken

From code for post type and custom taxonomy, your CPT is post_features and taxonomy is features.

For single post_features, you need to have file named single-post_features.php. For archive, create file taxonomy-features.php.

See documentation for detail. https://codex.wordpress.org/Post_Type_Templates

Example for single(single-post_features.php):

<?php get_header(); ?>
<?php
if ( have_posts() ) {
  while ( have_posts() ) {
    the_post();

    the_title();
    the_content();
  } // end while
} // end if
?>
<?php get_footer(); ?>

Example for Archive(taxonomy-features.php):

<?php get_header(); ?>
<?php
if ( have_posts() ) {
  the_archive_title( '<h1>', '</h1>' );
  while ( have_posts() ) {
    the_post();
    the_title();
    the_content();
  } // end while
} // end if
?>
<?php get_footer(); ?>

Note: Please flush your permalink if you are getting 404 error.