Marque select one object within a soft group selects the whole soft group

[Know1]

I don't know if this is wrong or if it's supposed to work this way, but I find it odd.

Drag a bounding box around one object in a Soft Group and the entire Soft Group gets selected.
I'd expect the Soft Group to be ignored unless the entire Soft Group is within the marquee selection, like how a normal group behaves.