When doing drag and drop to the bottommost TLI in a grid, which is already a parent item, I've had a couple of items disappear from both the source and the target grid (i.e. the dragged item was orphaned). I can't reliably reproduce it but the target parent item at the bottom of the target grid had its subitems collapsed and I hovered over it until the indicator that the drag will be added as a child appeared. When I let go of the mouse button, the bug occurred. When I tried to reproduce it wouldn't always happen, but I'm sure it happened a couple of times. Had to search for the item and manually set field values in the PP to get it back in the grid(s). Thanks!