When using an anchor the unbroken geometry collections becomes kinematic ( anchored )
( because the root has kinematic anchored pieces in its hierarchy )
If the colliding object is a kinematic as well , no collision will be recorded ( Hit events need to involve at least one dynamic object )
If you want kinematic kinematic event, you need to look into overlap events or trace ahead of the moving kinematic to detect collisions
Hope this helps
Cedric