Bug report

Reproduction of the problem

1. Open the Dojo - https://dojo.telerik.com/qltIZDpc
2. Open the popup ad try to scroll to load mroe items

Current behavior

Only the initial items are loaded. There are no additional requests.

Expected/desired behavior

Virtualization should work as expected even when grouping is enabled.

TicketID: 1719924

The issue is a regression starting with 2026.1.212

Environment

• Kendo/Telerik version: 2026.3.1015
• Browser: [all ]