Bug report
Insert on a node's children when using index of 0, аppends item wrongly to PanelBar
Reproduction of the problem
Dojo: https://dojo.telerik.com/iruWAwoy
Click the Insert button to see where the item in the PanelBar goes.
Environment
Kendo UI version: [all]
See DoJo
This calls the DataSource read() method 10 times, but after 10 seconds only 2 of them are resolved (and actually only 2 requests are recorded in dev tools).
This is really annoying when relying on logic in a .then() block, because it is never called in the remaining cases.