I find this a lot; if the loose geometry lies on top of a group.component, then double-clicking to select the face and all connected edges of loose geometry will instead edit the underlying group.
I have 2 work-around’s I normally use:
- use a selection box - down side is that you can often select stuff you didn’t intend to.
- hide the underlying group - down side is that it’s another three clicks to un-hide it again.
You could also select and move the underlying group away from the geometry (select move and type in a specific value - then it’s easy to move it back again by the same amount)
Or you could draw a line and make it into a group before adding in the loose geometry (so that when you are adding it, it’s already in a group and the double click will work to select as you expect)