Image Transformations on workers.dev urls?

Do image transformations not work on workers.dev urls?

I have a zone with Image Transformations enabled, and in the Transformations settings I have included a workers.dev url under "Specified origins". I have my domain listed, and my preview url listed, which is a workers.dev url like this:
xyz-web-preview.myaccount.workers.dev


Image transformations work when I load the site with my domain, but not with the workers.dev url.

I'm running an opennextjs site ... does this currently not work? Is there a workaround that involves writing a custom worker to do the transformations via bindings? Or maybe I can make a preview.mysite.com url and run the preview site there?
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