Hi @nl-setech, I'm investigating a similar problem in Custom Components Auto Height Issues which might be related to the issue with List View items not getting the correct height.
Regarding the double scroll bar – we give List View a default max height of 100vh as a safeguard against developers creating a very long list which could cause performance problems. This appears to be what is causing the double scroll bar here.
You can adjust it in the advanced Appearance editor for List View, but to avoid performance issues we would generally recommend setting a fixed height on the List View instead, or putting the List View inside a Stack container and using the "Fill" layout option.