ComboBox Invisible

I have some wired problem and cant figure it out. I have a worldmap view where all projects of my company are marked and i tried to add a combobox but it is invisible for no reason. My last try was to only add a ComboBox to the view but it is still not where

@PageTitle("Worldmap")
@Route("Worldmap")
@AnonymousAllowed
public class WorldMap extends HorizontalLayout {
    private final Map map = new Map();
   
    public WorldMap(WorldMapService worldMapService){

        ComboBox<Projekt> projectsWithoutCoordinates = new ComboBox<>("Projekte ohne Koordinaten");
        projectsWithoutCoordinates.setWidthFull();
        projectsWithoutCoordinates.setItemLabelGenerator(Projekt::getName);
        projectsWithoutCoordinates.setItems(worldMapService.getProjektWithNoWorldMapEntrie());
        setSizeFull();
        add(projectsWithoutCoordinates);
    }
}

In my Browser i can see the ComboBox if i inspect the site:
image.png

Was a side effect from upgrading the vaadin version from 24.1.16 → 24.3.2. I solved it by deleting node_modules and target folder