How can I make an actor collide with objects on server and client

So I have a relatively simple question however I don’t even know how to phrase it to find anything related in the slightest bit. Basically in my game the level is 100% void of any geometry on start, this is because the world gets generated procedurally based on a seed and modified chunks are also loaded from a file. I have this procedural world replicating on the client just fine. The issue starts with how the clients send the server their position in a replicated event in order to not fall out of the world when they walk out of the rendered chunks of the server’s game instance. That is fine however when the client breaks a block, the server spawns an item where the block was broken and the item falls into the void. My question is: how can I make the item actor collide with geometry on the client and the server