Thread:Talk:Flow Portal/Interactive Prototype/Weird comment reordering

I'm testing the new prototype and I'm unable to make sense of how comments are reordered when several thread levels are involved. I don't know if this is a bug or the expected behavior, given that the post is animated and mover to different place after I press "Reply" instead of standing there where I wrote it.

Say we have this existing conversation:


 * Post by user A
 * Post by user B
 * Post by user C

Now if I post a reply to the first post by user A, this is the result:
 * Post by user A
 * Post by user B
 * My reply to user A
 * Post by user C

This makes it seem like user C was replying directly to me! Also all connection between user B and C is lost. The only hint that something weird happened (apart from the conversation not making any sense) is because "My reply to user A" has a more recent timestamp than "Post by user C".

What I expected to happen is this:


 * Post by user A
 * Post by user B
 * Post by user C
 * My reply to user A

This is how conversations with different depth levels are handled nowadays. It's a common idiom at places like Slashdot and Reddit. I hope this behavior is a bug? If not, can someone please explain it to me?