If an Aura is in a D.Group then it has no anchor settings in its Display tab.
While viewing the Display tab if you use the ◄ (left arrow) to drop the Aura out of the group, no Anchor options appear. They do show if you deselect and reselect the Aura. (As such this is minor but thought I'd make a quick ticket while I remembered)

To replicate:
Make a D.Group
Make an Icon in the group
Drop the icon out of the group
(see settings)
Deselect the Icon
Reselect the Icon
(see settings)

This is annoyingly complex to fix, because it's also broken for drag and drop.

Yeah, it's unfixed. It's still on my todo list.

This bug ticket has been open for more than a year now. Does it still occur, and if so, are we going to fix it eventually?