Hierarchical custom post types "display_column" not working.

Hi,

I've had an issue with custom post type registered with hierarchical attribute to on. The display column content would not show up with those with this attribute set to true. Everything works fine if I set the attribute to false. I have been able to resolve the issue myself by modifying the following (in custom-metadata.php):

line 178
from : `$column_header_name = sprintf( '%_posts', $object_type );`
to : `$column_header_name = sprintf( '%s_posts', $object_type );`

line 198
from : `add_action( "manage_{$column_content_name}_custom_column", $custom_column_content_function, 10, 3 );`
to : `add_action( "manage_{$column_header_name}_custom_column", $custom_column_content_function, 10, 3 );`

line 200
from : `add_filter( "manage_{$column_content_name}_custom_column", $custom_column_content_function, 10, 3 );`
to : `add_filter( "manage_{$column_header_name}_custom_column", $custom_column_content_function, 10, 3 );`

Start in custom-metadata.php around lines 178, 198, and 200, where the custom column name and hooks are built. Reproduce the issue with a hierarchical custom post type, then verify that the display column content appears while existing non-hierarchical custom post types continue to work.

Written by the indexing model from the issue text.