new child is added to the parent when collapsing the parent

hi team
i have a tree where in the sub childrens they have 2 sub children which are having the same id

parent 1 (id:1)
---child 1(id:2)
--- child 12(id:3)
-- child121(id:4)
--- child(1211)(id:5)
--child 2(id2)
--child 21(id:4)
-- child 212(id:5)

when we closed the child121 we expected to hide the child1211 but its not hiding

we are using the changeNodeAtPath to update the tree