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It looks like the plugin is not able to fetch the critical CSS. It’s just generating about a thousand errors to the browser console with the message”:
Blocked script execution in ‘<URL>’ because the document’s frame is sandboxed and the ‘allow-scripts’ permission is not set.
I assume that Jetpack is using XML-RPC file and we have special rules in place to allow access to xmlrpc.php from Jetpack and WordPress but blocks the rest. The hosting provider is automatically fetching those IPs from here: https://jetpack.com/ips-v4.json
I read from some other support thread that we should allowlist the URL 35.188.32.9. If that’s the case, then you should add it to that list.