I have been browsing the web for 4 hrs. Those solutions won't solve my problem.
The modified template in child theme was working when placed in root directory.
However, after child templates are moved to a subfolder, they can be selected when adding to a page.
But once I refresh the website, a new page using the parent template is automatically created.
The code uses et_get_page_link( "profile" ) to retrieve the link.
The corresponding code is as below. I xdebugged it and found that I triggered
// update page template option
update_post_meta( $id, '_wp_page_template', 'page-' . $page_type . '.php' );
for some reason. And didn't trigger when child template was under root directory.
/**
*
* Get the page template link
*
* @param string $pages : login or register
* @param array $params : array of query var
*
* @return $link
* @author Dakachi
* @version 1.0
* @copyright enginethemes.com team
*/
if ( ! function_exists( 'et_get_page_link' ) ) {
function et_get_page_link( $pages, $params = array(), $create = true ) {
$page_args = array(
'post_title' => '',
'post_content' => __( 'Please fill out the form below ', ET_DOMAIN ),
'post_type' => 'page',
'post_status' => 'publish'
);
if ( is_array( $pages ) ) {
// page data is array (using this for insert page content purpose)
$page_type = $pages['page_type'];
$page_args = wp_parse_args( $pages, $page_args );
} else {
// pages is page_type string (using this only insert a page template)
$page_type = $pages;
$page_args['post_title'] = $page_type;
}
/**
* get page template link option and will return if it not empty
*/
$link = get_option( $page_type, '' );
if ( $link ) {
$return = add_query_arg( $params, $link );
return apply_filters( 'et_get_page_link', $return, $page_type, $params );
}
// find post template
$pages = get_pages( array(
'meta_key' => '_wp_page_template',
'meta_value' => 'page-' . $page_type . '.php',
'numberposts' => 1
) );
// page not existed
if ( empty( $pages ) || ! is_array( $pages ) ) {
// return false if set create is false and doesnot generate page
if ( ! $create ) {
return false;
}
if ( ! ae_get_option( 'auto_create_page', false ) ) {
// insert page
$id = wp_insert_post( $page_args );
if ( $id ) {
// update page template option
update_post_meta( $id, '_wp_page_template', 'page-' . $page_type . '.php' );
}
} else {
$id = - 1;
}
} else {
// page exists
$page = array_shift( $pages );
$id = $page->ID;
}
if ( $id != - 1 ) {
$return = get_permalink( $id );
} else {
$return = home_url();
}
/**
* update transient page link
*/
update_option( 'page-' . $page_type . '.php', $return );
if ( ! empty( $params ) && is_array( $params ) ) {
$return = add_query_arg( $params, $return );
}
return apply_filters( 'et_get_page_link', $return, $page_type, $params );
}
}
I am only getting too many files and I don't want to put everything under root directory of child theme. So it is not a big issue bothering me too much.
But I feel very annoying I couldn't put php files by type into subfolders.
But it is wasting me too much time.
After creating this page manually with admin privilege
Reload the website, a new page using parent template is automatically created
question from:
https://stackoverflow.com/questions/65914982/wordpress-uses-parent-template-after-moving-child-theme-modified-template-into-s 
