Removes the `current_page_parent` class from the blog page link when not viewing a blog related page

remove-current-page-parent.php

<?php
/**
 * Removes the `current_page_parent` class from the blog page link when not viewing a blog related page
 *
 * @param array    $classes The CSS classes that are applied to the menu item's `<li>` element.
 * @param WP_Post  $item    The current menu item.
 * @param stdClass $args    An object of wp_nav_menu() arguments.
 * @param int      $depth   Depth of menu item. Used for padding.
 */
function cameronjonesweb_remove_current_page_parent( $classes, $item, $args, $depth ) {
	// Fix the current_page_parent class being added to custom post type archives.
	if ( in_array( 'current_page_parent', $classes, true ) ) {
		$blog_page = get_option( 'page_for_posts' );
		if ( ! is_home() && ! is_singular( 'post' ) && ! is_category() && ! is_tag() && ! is_author() && wp_get_post_parent_id( $item->object_id ) !== $blog_page ) {
			$key = array_search( 'current_page_parent', $classes, true );
			unset( $classes[ $key ] );
		}
	}
	return $classes;
}