When a DropDownList is configured with both sticky headers and grouping, the first group header is rendered twice when opening the component - once as the sticky header and once as part of the list.

Currently, there is no built-in way to suppress this duplicate. Achieving the desired appearance requires custom CSS styles, and in cases where virtual scrolling is enabled, custom DOM manipulation of internal elements is needed, which causes side effects and edge cases.

Enhancing the DropDownList with a built-in option for achieving this would allow developers to control this behavior without relying on unsupported workarounds.