Jones wrote:The Z-order within grouped features gets scrambled after dragging them
EDIT: if you ungroup them before dragging the Z-order is kept. Strange bug.
I am seeing an issue with Z-order scrambling when dragging multiple features to a different parent, both in the layers and on the map, but it's regardless of whether the features are grouped or not. That'll be fixed in next release, but is that what you're seeing?