Treeview loading indicator is stuck when adding children with drop

[yanmariomenev]

Description

The loading indicator sometimes gets stuck loading until you expand and collapse the node. This seems to happen when you drag all nodes in the last node and leave only the last node present. The dragging needs to happen on a non-expanded node to reproduce the loading issue. If you expand the node, for example, using kendoTreeViewExpandable with expandBy, then there is no issue.

The behaviour itself also seems a bit inconsistent, as sometimes it will expand the node if you drop it in the first or second node, but at the last note it will not expand, which seems to also cause the loading indicator to get stuck like that.

Steps To Reproduce

https://stackblitz.com/edit/angular-xiwrcwsx-7bnzgvzy?file=src%2Fapp%2Fapp.component.ts

1. Drag "Node 1" on "Node 3" (add as child).
2. Drag "Node 2" on "Node 3" (add as child).
3. The indicator on "Node 3" is stuck.

Screenshots or video

Screen.Recording.2025-10-03.at.10.45.39.mov