All my sites updated to 6.0 and they’re still working.
Best to check with your host, as the 520 link in your post suggests. Or post more information here if you’d like help. A domain name would be a good place to start.
That already tells, that the Web server is returning an error. Not Cloudflare. Also, Cloudflare did not change because of your Wordpress v6.0 update - so the error must be on your site.
Hint: most Themes/Plugins are not immediately compatible with new major version upgrades. Check them before you update.
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