We’re experiencing teething issues with a new “CDN” deployment which has caused issues with comments. The basic function of a CDN is to trade freshness for raw speed, with appropriate rules in place to ensure your experience is better overall. Something is not working as intended and it will take a few days, most likely, to track down.
Comments may appear to fall into a black hole, but a little patience should be rewarded. You should not need to do anything special.
UPDATE: our CDN provider “Fastly” is working with one of the plugin developers on the problem.