I have made a TreeView with item.name as a more complex object, where I wanted to use a LabelGroup within it; but this leads to
Warning: validateDOMNesting(...): <button> cannot appear as a descendant of <button>.
A screenshot is below

I guess the problem here is that the expandable-row (pf-c-tree-view__node above) from the TreeView is made with a button (highlighed above), but then the LabelGroup wants to use a button to have the group expansion too; e.g.

A suggestion might be that the TreeView should somehow be implemented with a div/onclick instead of a button to give a bit more flexibility to the internal tree view elements?