An element added to horizontal layout is not shown

[burumdev]

I'm working on a demo of sorts to practice standard slint widgets. One last item I add to a HorizontalLayout doesn't show-up. I have a hierarchy of layouts like this:

VerticalLayout
    HorizontalLayout
        Items... (This works fine)
    HorizontalLayout
        Items... (First two items show fine but last VerticalLayout item is nowhere to be found.)

I get no errors while compiling the code. No panics while running the app.

The item not showing can be found here:
https://github.com/burumdev/slint-std-widgets-showroom/blob/2bc6f2a51856db55ab68130808392e8834e8881e/ui/tabs-1-buttons.slint#L172

Thanks.