I was checking some replies to my comments, noticed a type in it an went to edit it to fix it.
Then, when trying to post the updated comment, I couldn’t find the “Save” or “Post” button.
Then I found out the button what there, but it’s hidden; only a couple of pixels of it are visible, but there’s no way you can make it visible by scrolling or whatever.
Using Developer Tools it gets revealed that it’s there:
This is a serious usability problem as it makes almost impossible to post/update the reply.
I’m using Edge.
BTW, it also happens while posting this.