Diagram save button in edit dialog is not working

[gdenchevprog]

Bug report

The save button in the diagram's edit dialog is not working.

Reproduction of the problem

1. You can check the following example in our API docs:
   https://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/diagram/configuration/editable.connectiontemplate
   Or go to https://demos.telerik.com/kendo-ui/diagram/editing
2. Click on one of the connections/shapes and try to edit it. Then try to click on the "Save" button, nothing happens.

Current behavior

The save button isn't working and its icon is missing.

Expected/desired behavior

The save button should work as expected.

Environment

• Kendo UI version: 2023.2.606 (regression)
• jQuery version: 3.4.1
• Browser: [all]