I have tried a 3 and 4 level hierarchy in the new native hierarchy slicer and using it with multiple item selection. I'll start with all items selected, then going through to deselect items i dont want.
I've noticed if i only deselect items at level 4, it works fine. As soon as i then make a deselect something at level 3, it no longer works properly and all items deselected then show up in all other visuals. It seems to be happeneing when i do deselections at different levels of the hierarchy.
See the video showing the error. I confirmed it in multiple dashboards.