Only thing I can suggest is adding “a whole load” of them into a scene and firing them at once.
The tricky thing is that this particular error isn’t cropping up right now for us, but a similar one (with lots of radial forces overlapping and firing at once) seems to be. It’s a tricky one for us to catch, let alone repro, and an even trickyer one to work heads or tails of thanks to the physx error messages.