OK. Gotcha, thnx for clarifying.
This new appearance behavior is basically how I've been handling nested groups (in iXForms. see this thread). So, for me at least, it raises the question of should this perhaps be the default behavior (!); that is, by default all sub-groups are identified as such (using the "Group" footer at the bottom of the respective row) and selectable. And instead only introduce an appearance to explicitly not display a group as such, which strikes me as the less common usecase that needs a special appearance.
When nesting groups, it seems like the default behavior should be that they are all navigable (aka visible), unless specified otherwise. Thoughts?