Group and link relation

when the link one side going to free, one side not link to any node, it will belong to this group.
group edge line will stretch to the head of the link end.
But drag the link to completely free it will not belong to this group.
I want the link at any time not to belong to any group.

Sample code
https://jsfiddle.net/batobolg/rjb2cnv6/1/

image
image

Would it help you if you set this property to false?
https://gojs.net/latest/api/symbols/Group.html#computesBoundsIncludingLinks

It works, Thank you walter.

https://jsfiddle.net/batobolg/rjb2cnv6/2/