Within a day of installing the molecular script addon, selecting an object in blender 2.8, duplicating it (hitting "shift + d"), and confirming (if that's the right term) the duplication (hitting "enter") results in the two objects becoming linked. This problem is similar, but not identical, to the problem described in Can not find unlink object data in Blender 2.8 None of the solutions to unlink the two objects works.
A workaround: the second object is able to be moved without hitting "g", and that's enough to unlink it from the original.
The question is how to make a duplicate without having to move the copy of the original?