Finder in Sierra: How to get "Up" to "Macintosh HD" or "Volumes" Prior to 10.12, if I opened a Finder window and hit Command+↑ a bunch of times, I'd get to /Users, then Macintosh HD, then /Volumes

Now in 10.12, I can get as far as /Users but then Command+↑ becomes disabled. 

I can still navigate directly to either location with Command+Shift+G or by browsing via the sidebar. What's required to be able to navigate "up" to them from lower-level folders?
I don't know why, but toggling AppleShowAllFiles on and then off again fixed this.

defaults write com.apple.finder AppleShowAllFiles YES
killall Finder
defaults write com.apple.finder AppleShowAllFiles NO
killall Finder