No, it should work as in previous version.
But please note is not the same to replace a single item with a preset, than the opposite:
In the first case, Forest recognize the library preset as a collection of several items, and clears the Geometry List and replaces all its content.
But when you replace a preset with an item, there is nothing in the FP object which identifies the Geometry content as a preset, and replaces only the selected entry.
We could say the difference between single item/preset depends of the Library, but once imported all FP objects are similar.