Children and collisions

For some reason, collisions work fine on an example default cube (set to Static, ‘Actor’, ‘bounds’ unchecked) but stop working as soon as I parent that cube to something.

Is this a bug or some twisted feature? Is there a workaround?

A dynamic actor should not have a parent.

Oh. That really is quite a massive flaw in the plan…

But in Yo Frankie!, wasn’t the main character parented to an Empty? I read something and got the impression they were able to share logic between groups like that (although I’ve failed to achieve this myself.)

I think the mesh was parented, but not set to dynamic.
It relied on the dynamics of the empty.