I can’t upload a screenshot because Connect is giving me a weird error (Sync doesn’t have posting at all yet), but when I look at the comments, a lot of the top level ones have been replaced by a button that says “View Parent.” Pressing it seems to sometimes show the parent comment and sometimes just skip down to the next thread.
Those screenshots match some cases I’ve seen of the bug, but a lot of the time, it’s the very top level comment that’s hidden. It’s most likely the same bug though, as I do sort by Top. I’m glad I’m not alone!