Just turn on "display hull" when using compound with concave objects, and you will see what's going on, and what you have as collision... you can turn of display operator to see better.
The reason why you see "Convex" word inside Compound options, is because that's the option where it brake concave objects into lot's of small cpnvex collision objects (I assume that braking algorithm is pretty much the same as with voronoi operator)
Edit:
Ooops.. Ty was faster again. .
The reason why you see "Convex" word inside Compound options, is because that's the option where it brake concave objects into lot's of small cpnvex collision objects (I assume that braking algorithm is pretty much the same as with voronoi operator)
Edit:
Ooops.. Ty was faster again. .