Multiple URLs and wrong canonical url with ACF custom post type and custom permalink

[willmoy]

To Reproduce
Steps to reproduce the behavior:

1. Create a new custom post type (in my case Post Type Key = 'group')
2. Under Advanced Settings > URLs, change Permalink Rewrite to 'custom permalink'
3. In the URL slug box put %group% (the post type key)
4. Create a new post of that post type
5. View source, look for
6. The href in that tag is /%postname%/%postname%/

Expected behavior
/%postname%/ should return 200
The canonical URL should be /%postname%/
The URL /%posttypekey%/%postname%/ should return 404

The canonical URL is correct when Permalink Rewrite is set to Post Type Key, so this seems to be a problem with the custom permalink.

Changing the Front URL Prefix setting did not change this.

Code
[
{
"key": "post_type_659ff3e81e830",
"title": "Groups",
"menu_order": 0,
"active": true,
"post_type": "group",
"advanced_configuration": true,
"import_source": "",
"import_date": "",
"labels": {
"name": "Groups",
"singular_name": "Group",
"menu_name": "Groups",
"all_items": "All Groups",
"edit_item": "Edit Groups",
"view_item": "View Groups",
"view_items": "View Groups",
"add_new_item": "Add New Groups",
"add_new": "Add New Groups",
"new_item": "New Groups",
"parent_item_colon": "Parent Groups:",
"search_items": "Search Groups",
"not_found": "No groups found",
"not_found_in_trash": "No groups found in Trash",
"archives": "Groups Archives",
"attributes": "Groups Attributes",
"featured_image": "",
"set_featured_image": "",
"remove_featured_image": "",
"use_featured_image": "",
"insert_into_item": "Insert into groups",
"uploaded_to_this_item": "Uploaded to this groups",
"filter_items_list": "Filter groups list",
"filter_by_date": "Filter groups by date",
"items_list_navigation": "Groups list navigation",
"items_list": "Groups list",
"item_published": "Groups published.",
"item_published_privately": "Groups published privately.",
"item_reverted_to_draft": "Groups reverted to draft.",
"item_scheduled": "Groups scheduled.",
"item_updated": "Groups updated.",
"item_link": "Groups Link",
"item_link_description": "A link to a groups."
},
"description": "",
"public": true,
"hierarchical": true,
"exclude_from_search": false,
"publicly_queryable": true,
"show_ui": true,
"show_in_menu": true,
"admin_menu_parent": "",
"show_in_admin_bar": true,
"show_in_nav_menus": true,
"show_in_rest": true,
"rest_base": "",
"rest_namespace": "wp/v2",
"rest_controller_class": "WP_REST_Posts_Controller",
"menu_position": "",
"menu_icon": "",
"rename_capabilities": false,
"singular_capability_name": "post",
"plural_capability_name": "posts",
"supports": [
"title",
"editor",
"thumbnail"
],
"taxonomies": "",
"has_archive": false,
"has_archive_slug": "",
"rewrite": {
"permalink_rewrite": "custom_permalink",
"slug": "%group%",
"with_front": "1",
"feeds": "0",
"pages": "1"
},
"query_var": "post_type_key",
"query_var_name": "",
"can_export": true,
"delete_with_user": false,
"register_meta_box_cb": "",
"enter_title_here": ""
}
]

Version Information:

• WordPress 6.4.2
• PHP version: 7.4.33
• ACF Version Version 6.2.4 Free

[mattgrshaw]

Hi @willmoy

If I understand this correctly, I'm not sure this is an issue with ACF - I can replicate the same without ACF activated via register_post_type():

function test_register_post_type() {
	$args = array(
		'public' => true,
		'labels' => array(
			'name'          => 'Trees',
			'singular_name' => 'Tree',
			'menu_name'     => 'Trees',
		),
		'rewrite' => array(
			'slug' => '%tree%',
		),
	);
	
	register_post_type( 'tree', $args);
}
add_action( 'init', 'test_register_post_type' );

Creating a new post with the name "Maple" results in the following canonical:
https://acf.test/maple/maple/ (200 OK response)

Visiting /%postname%/ results in a 301 redirect to /%postname%/%postname%/.

Please let me know if I've misunderstood this and we'll take another look. Thanks!