Sorry but I just can't beleive this has been simply overlooked;
In the old website you could create a chain of three replies.
On all of my projects every single third reply is gone.
I had some really really funny conversations and really nice comments that I loved to read from the old site… and now they're gone… is there a specific reason for this? Or was it really overlooked?

I also reported this issue here in the bugs forum:

http://scratch.mit.edu/discuss/topic/4647/

Response is that they're working on it and will fix it.