all of a sudden my child theme style.css is being ignored? Its been working fine for months?

Required (child) Theme Files

Check if your child theme has a

• style.css
• functions.php
• screenshot.png (optional, but will help you differentiate)

Recommended basic functions.php for a child theme

<?php
/**
 * Example child theme Remzi Cavdar
 *
 * @link https://developer.wordpress.org/themes/advanced-topics/child-themes/
 *
 * 
 */


function use_parent_theme_stylesheet() {
    // Use the parent theme's stylesheet
    return get_template_directory_uri() . '/style.css';
}

function child_theme_branding() {

    // Uncomment this if you want versioning in your child theme stylesheet
    // $themeVersion = wp_get_theme()->get('Version');

    // Enqueue our style.css with our own version
    wp_enqueue_style( 'child-theme-branding', get_stylesheet_directory_uri() . '/style.css', array(), null );

}

// Filter get_stylesheet_uri() to return the parent theme's stylesheet
add_filter( 'stylesheet_uri', 'use_parent_theme_stylesheet' );

// Enqueue this theme's scripts and styles (after parent theme)
add_action( 'wp_enqueue_scripts', 'child_theme_branding', PHP_INT_MAX );