That's correct they won't show up if the Figure's skinning is unimesh. I'm pretty sure that was a deliberate change. I's been like that since Poser Unimesh skinning was first introduced in Poser 11.

The IK goals showing for Poser Traditional skinning was a "bug" but when it was reported somebody <.< said, "Hey don't fix that, it's a useful bug!"

Interesting how Poser features so often grow out of useful bugs. :-)