Yes, I assumed as much. It seems then that this is not so much a bug as a lack of completion support for multi-level fact when entering filter conditions?
To my knowledge, completion support for say "os.release.full" when filtering in "Status / Filter by value" has never worked, whereas adding the full fact name and adding it manually seems to work.
Well, since Puppet tries to deprecate the use of top level facs, then it would help a great deal if the GUI supported the use of multilevel facts, or what-you-may-call-em, in frequently used functions like filtering.
I don't know if this is something being worked on, if it's far down the todo-list, or if there is a proper place to submit a feature request for this?