The border of the RadListBox is missing in the Office2019 theme if System.Windows.xaml resource dictionary is not merged.
Can be reproduced when RadListBox is placed inside a Grid, a StackPanel with horizontal orientation or a WrapPanel. Available in LIB version 2016.1.125, it will be also available in the 2016 Q1 SP1.
Available in the 2016 Q1 Release.
When the ItemsSource of the control is changed to a new collection the old selected items are cached and if a collection containing the old selected items source is set as ItemsSource the cached items are restored. Make it possible to disabled this functionality per control. Available in the 2017 R1 Release (2017.1.117).
The "auto scroll into the view on selection" functionality does not to work as expected if the ItemsPanel is changed and a selection was previously done.