[PNJSNAK]

A few years back I went around a corner a bit agressively and when I got back to the garage I noticed the rear end off to one side.
Here I broke the weld on the fixed side, not the threaded side.
I had it welded and added a Panard bar, no issues since then.
The original 4 link ALuminum bars were more than enough to keep the rear end in place, but when you go to the adustable units all that side loading goes thru those welds.
You need the Panard bar to keep the rear end in place in that center arc of the suspension.