PHP 7.4.2 環境に Twig 3.0 を入れようとしたらエラーが起きる

やったこと

composer init
composer clear-cache
composer require twig/twig:^3.0

結果

Do not run Composer as root/super user! See https://getcomposer.org/root for details
Using version ^3.0 for twig/twig
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 3 installs, 0 updates, 0 removals
As there is no 'unzip' command installed zip files are being unpacked using the PHP zip extension.
This may cause invalid reports of corrupted archives. Besides, any UNIX permissions (e.g. executable) defined in the archives will be lost.
Installing 'unzip' may remediate them.
  - Installing symfony/polyfill-ctype (v1.13.1): Loading from cache
  - Installing symfony/polyfill-mbstring (v1.13.1): Loading from cache
  - Installing twig/twig (v3.0.1): Loading from cache
Generating autoload files

Installation failed, reverting ./composer.json to its original content.


  [ErrorException]
  require(/mnt/project/virtual/htdocs/www/admin/vendor/composer/../symfony/polyfill-ctype/bootstrap.php): failed to open stream: No such file or directory


require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>]...

ディレクトリ構成

www/
  admin/
    application/
    public/
      index.php
    vendor/
      composer/
        autoload_classmap.phpなど
      autoload.php
    composer.json