When dragging a block to move it in the Navigator, the dragged block does not always keep up with the movement of the cursor/drag preview box. The expected behaviour is that it will “stick” to the cursor more. This seems to happen when the cursor initially moves quickly upwards causing the block to be shifted inside/outside of a containing block. When this happens, the delta remains at this extended distance and does not snap back to the cursor for the duration of the drag.
Relatively minor issue in the grand scheme of things, but moving items around in the Navigator isn’t quite 100% bulletproof yet. See my screengrab below: