@hongminheeๆดช ๆฐๆ (Hong Minhee) 
it doesn't work with this object: https://federated.id/objects/2e6cf5a8-ffa8-4fca-b4cd-8e0c9a584a75
The way it's meant to be threaded: https://brutalinks.tech/~marius/2e6cf5a8-ffa8-4fca-b4cd-8e0c9a584a75
I suspect this is due to some replies in its replies collection pointing to multiple object IRIs.
@mariusormarius Hello, thank you for trying this out ๐. When I created this program, what I defined as a "Thread" was a long post continued by replying to one's own post.
For example, you write post A, hit the character limit, continue in reply B, hit the character limit again, and continue in reply C to B, and so on.
Looking at the link you provided https://brutalinks.tech/~marius/2e6cf5a8-ffa8-4fca-b4cd-8e0c9a584a75, it doesn't appear that there are any replies chained to that Note object.
Therefore, since it doesn't fall under the above definition of a "Thread," this is not a bug. However, if needed, it may be worth reconsidering how we define a "Thread."
If you have a fediverse account, you can reply to this note from your own instance. Search https://hackers.pub/ap/notes/019c37bc-418d-7dfc-89b0-b54da193fc3e on your instance and reply to it.
When @hongminheeๆดช ๆฐๆ (Hong Minhee) mentioned it I thought it was about reply threads, oops. :)