What happened to Joints? ( Or... is it just my imagination?)

Updated to 0.2.5 (preview 1) from 0.2.4 (I think). I also updated to 2019.3.0f1.

I have a scnario whereby I "throw" objects by applying a velocity on a single object that is connected by joints to about 6 other objects.

Previously (with YouTube recorded evidence ), the hyper-velocity object dragged all other objects along with it. There was no noticable stretch in the joints. The joint distance was honoured.

But now, that exact problem is occuring. If it's by intention. all good, I'll work around it. But, if it's not, was the Joint behaviour fiddled with recently? Because my full object (a group of about 6 objects joined by Joins) is now spread across the scene like butter across hot toast for the first, let's say 0.5 - 1.0 seconds. Enough to actually be noticable to the human eye.