A probably bug in RadzenTree since version 2.15.4

I have used RadzenTree since version 2.14.0. But today I noticed a bug in it. Adding a node to an existing node does not reflect the changes. I noticed that this problem occurred from version 2.15.4 onwards. The problem is solved if I use version 2.15.3 or earlier:

Before version 2.15.4

After version 2.15.4