I have noticed that if there are enough comments and you click 'show more comments' it removes the 'reply' button for each comment, unless it is the users own comment!
You can check the issue with this question, as it has 'show more comments'
I can't see what you mean, do you have screenshots of the behaviour?
I can confirm this. Clicking the "Show More Comments" button removes the little "reply" icon that shows up when you hover your mouse next to a comment's header. It's usually to the right of the vote up and vote down buttons, and to the left of share, but it's gone if you click show more comments in OP's link.
It only tends to disappear for me if the comment is already nested a few times.
This topic is a bit dated, not sure if still relevant, but have noticed the same behaviour recently so am adding another example. The latter comments in thread below, after pressing show more comments does not display the Reply icon, even when hovering.
I've always just assumed we're only allowed a couple of nesting levels.
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[Bug report] Comments in moderation can only be published.
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