Yeah, I have the same issue. I also tried to comment on it, and I tried to comment on a post from a lemmy.blahaj.zone community and neither worked. Is it possible that that instance blocks posts/comments in communities from that instance or on posts from users from that instance?
I know for me, at least, it's giving me a delay where it has the spinning icon for a solid 10 seconds or so, and then the comment actually goes through. I'm not sure if it still goes through if you click off the page, though. I just wait for it to post first.