Layered Diagram throws an error #8311
Description
Bug report
Layered Diagram throws an error since 2025.2.520
Regression introduced with 2025.2.520
Reproduction of the problem
Dojo example - https://dojo.telerik.com/RQTEhStd
Diagram repo: https://github.com/telerik/kendo-diagram-common/issues/45
Environment
Ticket ID: 1694198
Kendo UI version: 2025.2.520 or newer
Browser: [all]