I have a similiar issue. In my case i would like to have an overlap response between an collision box and the landscape. I works perfectly on the client but i also try to call the same function from the server wich always fails for some reason. Everything is set to overlap and fully replicated. Did you find any fixes for this?
EDIT: Nevermind in my case the collsionbox was slightly above the landscape due to a wrong calculation on my side. The collsion works perfectly fine now!