Fully caching WordPress site by CDN (eg. Cloudflare)

Are you able to try this?

https://community.cloudflare.com/t/wp-admin-bar-being-cached-and-served-to-users/64797

There are a few more tips here:

https://ttfb.io/blog/how-to-set-up-cloudflare-to-cache-wordpress-pages/

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