I’ve been having a look, it looks to me like an issue that may have been introduced in 7.11.16, as it works on 7.11.15
I’ve given it a try on an upgraded local instance (from 7.11.15->7.11.17)
As well as on a Fresh install of 7.11.16
On these versions, I’m also seeing strange behaviour in the Roles panel
It looks as though it’s not accepting “Disabled” or “None” as options
Though the other options, (such as “Group” or “Owner”), seem to be working