Duplicating a UActorComponent that has an Instanced UPROPERTY does not perform a deep copy of the instanced property. It appears to only copy a reference to the instanced object. Where as, performing a copy of an instanced component will be treated as a "deep copy" instead of a reference.
Project has been attached for easier reproduction.
Expected:
All three components should have their own InstancedProperty object.
Results:
The original component's and the duplicated component's InstancedProperty fields point to the same object.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-68780 in the post.