Possibly when the roots were pruned last, either by you to get in bonsai pot, or by the seller to you to make it fit a pot or package for shipping. If that branch had a major root, directly under it in the soil, that was feeding it and that root has been cut off, the lack of nourishment, food or water, traveling up the trunk is no longer there. That might make that branch die. Or at least drop it's leaves until feeder roots form where the cut off root was. It's possible that the branch could come back with leaves in a month or two.
What type of cherry tree are those and do they normally grow in Jakarta, Indonesia? I think of cherry trees as being a tree that normally grows in an area that the heat and humidity that you must see there. Do you have other cherry trees that are doing fine?