I got a question about the MSA on Jeppesen arrival plate (RCTP 20-2). The MSA circle  was divided into three sectors with three altitude before, but I found that it becomes only one altitude(not divided anymore) on the new version. I've been looking for the reason for a long time but still can't figure it out. Does anyone know why they did such the change?
[enter link description here][1]
[enter link description here][2]


  [1]: https://imgur.com/WgpiW0S
  [2]: https://imgur.com/sW3IYhd