Since 2.15.0 of the Radzen.Blazor NuGet package, adding an "id" attribute to any Radzen Blazor component now has the component display a randomised id instead of the one assigned in the markup.
A simple example to see this behaviour in action, is on any Blazor page add the following button:
If you load this up using 2.14.6, then the "button" element will have the correct id. If you load it up in 2.15.0 or newer then a randomized id is populated instead.
Having an assignable id is important for css styling.