I’m not aware that there is an option that previously created parts with the Scatter tool will be recognized by the current Scatter tool in use.
From my perspective, the idea was that the list can contain different objects, and one would “paint” those in one session with the Scatter tool.
I assume that the large drops are the main focus of the art direction. Hence why they are “painted” first.
Here is a little idea:
The data of the larger drops will be used in the Clone selection of the “dew” mini drops. The large drops will determine the MoGraph Selection, which is then used to “Hide Selected”.
All the best