I'm testing the builds right now. I'm having a problem.
version: 2.80 (sub 17), branch: blender2.8, commit date: 2018-06-08 21:56, hash: 86660aa, type: Release
build date: Sat 06/09/2018, 04:24 AM
1/ I add in my scene a plane. -> OK
2/ I look at the collection, it's outside. -> Bug ?
3/ I create a collection "soil". -> Ok
4/ When I move in the flat ground collection, there is a copy. -> Bug !
5/ In addition we can not hide the collection that is not affected. -> Bug !
Attached are some working files: