I noticed this when reading story with comments enabled.
On the first load of the last chapter of the story, the most recent 10 comments are displayed, and the code has the comments' timestamp generated by script block and a noscript block. However, the subsequent pages of comments (generated by getmore requests) the response has timestamps of comments (presumably) the same(?) as the noscript block, resulting in situations where clicking the second page then the first page comments result in comment timestamp mutated.