Google Anayltics utm_source parameters gives access denied in Drupal

We have an odd error I’m not sure how to handle. We are running a Drupal site and just sent out an email campaign none of the users can access this page with the Google Analytics utm query parameters.

It gives them an access denied. However, if I log in to Drupal I can view the page just fine.

If you remove the utm parameters then anyone can access the page fine.

It seems to have started after we enabled caching on Cloudflare in the last couple of weeks. It worked fine before that.

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