On certain HN posts, I can up-vote and down-vote comments. Then on other comments in the same post, I can only up-vote (there is no down-vote arrow). Why?<p>Screenshot:<p>https://share.getcloudapp.com/Z4uj8w2l
Looks like they are too old?<p>You can't downvote replies and the reply feature is disabled after a certain amount of time, as well as when it is <1m old (under some circumstances?)