When you have a simple kendodropdown list that is set to adaptiveMode = "auto", resizing the browser throws. This can be reproduced on your demo pages.

Steps to reproduce:

1. use this Dojo: https://dojo.telerik.com/LHJLQgzy which was created from your demo page
2. Ensure the browser is narrow enough to be considered mobile
3. run the project
4. confirm dropdown is functional
5. resize the browser to desktop size
6. the dropdown list stops working and throws

kendo.virtuallist.js:2890 Uncaught TypeError: Cannot read properties of undefined (reading 'style')