Child theme css not loading when declared in parent functions

Because you’re using a subfolder path that starts with a /.

The official WP.org developer doc for add_editor_style has an example of how to add a stylesheet from a subfolder in the comments:

/**
 * Registers an editor stylesheet in a sub-directory.
 */
function add_editor_styles_sub_dir() {
    add_editor_style( trailingslashit( get_template_directory_uri() ) . 'css/editor-style.css' );
}
add_action( 'after_setup_theme', 'add_editor_styles_sub_dir' );

https://developer.wordpress.org/reference/functions/add_editor_style/#comment-2730

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