Duplicate rigid body collection bug?

Duplicating a collection in Blender 2.8 (I’m using blender-2.80-81b68f7279cd-linux-glibc224-x86_64) now duplicates the object hierarchy, so apparently the Collections Duplication Issue reported at https://developer.blender.org/T58702 has been fixed.

It seems, however, that if the original collection contains rigid bodies, the duplicated rigid bodies are not added to the ‘Rigid Body World’ collection, and so they don’t participate in the physics simulation.

Is this a bug, or is it supposed to be like this?

2019-06-09_16-32-15.blend (145.8 KB)

No response, so I created a bug report at https://developer.blender.org/T65674