STEPS TO REPRODUCE
- Go to a page
- Click 'Comment' button
- Add some text
- Click 'Add comment'
- Refresh the page (or navigate to another page)
- Observe the comment section and the comment posted
All buttons are present near the comment posted: 'Reply', 'Edit', 'Permalink' and 'Delete' buttons.
The 'Reply' button is missing (from all pages where are comments posted) and doesn't appear even if the comment is edited and then saved again.
However, it appears to be showing right after another comment is added, but still missing if the page is refreshed once again after that.
The issue could not be reproduced on XWiki 12.7 RC1 or XWiki 12.6.1.