php-WordpressプラグインがGoogleAppEngineでエラーを自動ロード-一部のクラスがロードされない

php74ランタイムのGAE標準環境でいくつかのWPプラグインに問題があります。次のようなエラーが発生し続けます：

 Fatal error: Uncaught Error: Class 'enshrined\svgSanitize\data\AllowedAttributes' not found in /workspace/wp-content/plugins/svg-support/vendor/enshrined/svg-sanitize/src/Sanitizer.php:87
Stack trace:
#0 /workspace/wp-content/plugins/svg-support/svg-support.php(36): enshrined\svgSanitize\Sanitizer->__construct()
#1 /workspace/wp-admin/includes/plugin.php(2288): include_once('/workspace/wp-c...')
#2 /workspace/wp-admin/plugins.php(192): plugin_sandbox_scrape('svg-support/svg...')
#3 /workspace/gae-app.php(63): require('/workspace/wp-a...')
#4 {main}
  thrown in /workspace/wp-content/plugins/svg-support/vendor/enshrined/svg-sanitize/src/Sanitizer.php on line 87
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vendor サブディレクトリがアップロードされ、クラスが欠落しているファイルがそこにあります（GCPデバッガーでデプロイされたアプリのファイルリストを確認しました）。

これは自動読み込みと関係があると思いますが、Wordpressとプラグインに関する情報は見つかりませんでした。

私のapp.ymlファイル：

 # App Engine runtime configuration
runtime: php74
service: default

# Defaults to "serve index.php" and "serve public/index.php". Can be used to
# serve a custom PHP front controller (e.g. "serve backend/index.php") or to
# run a long-running PHP script as a worker process (e.g. "php worker.php").
entrypoint: serve gae-app.php

# Defines static handlers to serve WordPress assets
handlers:
- url: /(.*\.(htm|html|css|js))
  static_files: \1
  upload: .*\.(htm|html|css|js)$

- url: /wp-content/(.*\.(ico|jpg|jpeg|png|gif|woff|ttf|otf|eot|svg))
  static_files: wp-content/\1
  upload: wp-content/.*\.(ico|jpg|jpeg|png|gif|woff|ttf|otf|eot|svg)$

- url: /(.*\.(ico|jpg|jpeg|png|gif|woff|ttf|otf|eot|svg))
  static_files: \1
  upload: .*\.(ico|jpg|jpeg|png|gif|woff|ttf|otf|eot|svg)$

- url: /wp-includes/images/media/(.*\.(ico|jpg|jpeg|png|gif|woff|ttf|otf|eot|svg))
  static_files: wp-includes/images/media/\1
  upload: wp-includes/images/media/.*\.(ico|jpg|jpeg|png|gif|woff|ttf|otf|eot|svg)$
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gae-app.php は、リポジトリのgoogleサンプル Wordpress on GAE standard environment から取得しました：

 <?php

/**
 * This file handles all routing for a WordPress project running on App Engine.
 * It serves up the appropriate PHP file depending on the request URI.
 *
 * @see https://cloud.google.com/appengine/docs/standard/php7/runtime#application_startup
 */

/**
 * Function to return a PHP file to load based on the request URI.
 *
 * @param string $full_request_uri The request URI derivded from $_SERVER['REQUEST_URI'].
 */
function get_real_file_to_load($full_request_uri)
{
    $request_uri = @parse_url($full_request_uri)['path'];

    // Redirect /wp-admin to /wp-admin/ (adds a trailing slash)
    if ($request_uri === '/wp-admin') {
        header('Location: /wp-admin/');
        exit;
    }

    // Serve up "index.php" when /wp-admin/ is requested
    if ($request_uri === '/wp-admin/') {
        return '/wp-admin/index.php';
    }

    // Load the file requested if it exists
    if (is_file(__DIR__ . $request_uri)) {
        return $request_uri;
    }

    // Send everything else through index.php
    return '/index.php';
}

// fixes b/111391534
$_SERVER['HTTPS'] = $_SERVER['HTTP_X_APPENGINE_HTTPS'];

// Loads the expected WordPress framework file
// (e.g index.php, wp-admin/* or wp-login.php)
$file = get_real_file_to_load($_SERVER['REQUEST_URI']);

// Set the environment variables to reflect the script we're loading
// (in order to trick WordPress)
$_SERVER['DOCUMENT_URI']    = $_ENV['DOCUMENT_URI']    = $file;
$_SERVER['PHP_SELF']        = $_ENV['PHP_SELF']        = $file;
$_SERVER['SCRIPT_NAME']     = $_ENV['SCRIPT_NAME']     = $file;
$_SERVER['SCRIPT_FILENAME'] = $_ENV['SCRIPT_FILENAME'] = __DIR__ . $file;

require __DIR__ . $file;
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[編集]影響を受けていることがわかったプラグイン：

svg-support 、 wordfence 、 post-smtp