Surface Test bug ?

[Gregory]

I tested here in a simple setup and it works as expected (it works for both deformations and transform motion in my test). Could you upload a scene file illustrating the problem you're having?

Hm...
False alarm; it works fine...

I was deleting particles inside the volume and had the wrong impression that they should re-appear once the test object moved away....
But, that needs a few extra steps to setup; the surface test works fine.

Sorry about that...