Collide of Rigid bodys like robots

I have got a problem using collisions and system V2

I want only to retrieve collisions of rigid bodys eg a robot to check if it’s clamp collides an object . This means it is not drived by force or gravity , but only positions are changed. (thus STATIC motion mode)
I can move it with it’s collide shape using v2 collisions api.

however, the collide observable is never called and thus I never know if there has been collision in the collide world.

I don’t understand how to deal with it.

I am sure that a simple PG repro would help a lot to answer your question.