How to reproduce in SKP 2021 - Version 21.0.392 on OSX 10.13.6.
- Have a scene with enough nested objects that the outliner has a scrollbar
- Double-click on a root-level group (the group should be highlighted and open within Outliner)
- Click on a component within the group.
The outliner scrolls to the top of the list making the user lose track of the position of the item in the list.
The outliner scrolls the selected component in view displaying the element within the scene hierarchy.
NOTE: The expected behaviour is the one I have always had using Sketchup Make 2017 on this same OS.