Bug report

DropDownList: dataItem(e.item) returns undefined when selecting across different groups

Regression since 2026.1.212

Reproduction of the problem

1. Open the next Dojo: https://dojo.telerik.com/aVJUwDTZ

2. Open the DropDownList.

3. Select an item from a group different from the one currently active/selected.

Observe the console for this.dataItem(e.item).

Current behavior
undefined is logged for this.dataItem(e.item)


Environment
Kendo UI version: 2026.1.212 or newer
Browser: all