Subtree collapse results in orphaned nodes without link to its parent

@nibinki wrote:

Hi
I got 2 subtrees where 1 node in a subtree is connected to another node in a subtree as shown in diagram . check the node which is expanded

pic1.PNG820×413 25.2 KB

if i collapse that node , gray node remains in its position with there is no link to its parent

image.png874×417 25.9 KB

How can i solve this and what is the reason for this

Thanks
Nibin

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