Bug report

The menu that determines where to add new task incorrectly appears after creating a new task and editing an existing one.

Reproduction of the problem

1. Open this Dojo example - https://dojo.telerik.com/uBAHUgOy
2. Add new task.
3. Randomly edit another task so that no item is selected in the Gantt TreeList.
4. Press the Add Task button again.

Current behavior

The Add Child/Above/Below menu appears unexpectedly.

Expected/desired behavior

The menu should not appear and a new task should be added at the bottom of the list.

Environment

• Kendo UI version: 2021.2.616
• Browser: [all]