#data protection

The workaround in comment #12 no longer works. What worked for me was just implementing the google-tag-gtm-iframe.html.twig template file in my Drupal theme:

{#
/**
 * @file
 * Overrides the Google Tag Manager noscript fallback iframe.
 *
 * It is intentionally left blank because GTM tracking is unnecessary
 * and against GDPR best practices when JavaScript is disabled.
 */
#}

This is not ideal, but we're in a situation where we can easily patch the module with the MR here due to being on a shared Drupal multisite instance.