Using a radcombobox which allows typing. if you put the cursor in the textbox the Home?end keys do not work. In previous versions the Home/End key moves the cursor to the begin/end of the typed text. You can see this isn't working on your demo site https://demos.telerik.com/aspnet-ajax/combobox/examples/overview/defaultcs.aspx
This was working in version 2018.2.710.45 but broken in version 2019.3.917.45