Hello,
Since the last update, the custom window action icons in our project are not working anymore. Also on the demos on the website they seem not to be working.
Please check the demos at the following links:
https://docs.telerik.com/kendo-ui/controls/layout/window/how-to/use-custom-action-icons
https://demos.telerik.com/kendo-ui/window/actions#
Thank you,
Iuliana