symfony/runtime error not disappearing [#3614451]

Problem/Motivation

When I logged into my site, it produced an error:

Error message
Your site does not pass some readiness checks for automatic updates. It cannot be automatically updated until further action is performed.
Failed to run process: <em class="placeholder">The command &quot;&#039;/opt/alt/php83/usr/bin/php&#039; &#039;/usr/local/bin/composer&#039; &#039;validate&#039; &#039;--check-lock&#039; &#039;--no-check-publish&#039; &#039;--with-dependencies&#039; &#039;--no-ansi&#039; &#039;--working-dir=/home/mysite&#039;&quot; failed. Exit Code: 1(General error) Working directory: /home/mysite Output: ================ Error Output: ================ In PluginManager.php line 798: symfony/runtime contains a Composer plugin which is blocked by your allow-p lugins config. You may add it to the list if you consider it safe. You can run &quot;composer config --no-plugins allow-plugins.symfony/runtime [tr ue|false]&quot; to enable it (true) or disable it explicitly and suppress this e xception (false) See https://getcomposer.org/allow-plugins validate [--no-check-all] [--check-lock] [--no-check-lock] [--no-check-publish] [--no-check-version] [-A|--with-dependencies] [--strict] [--] [&lt;file&gt;] </em>

(yes, the ' is what I see)

I added symfony/runtime to the allowed modules in composer.config, and updated my Drupal 11.3.13 site first to 11.3.16, then 11.4.4. I have cleared the caches, and manually checked for updates. However, the above error remains at /admin/modules.