Multiplayer in Moddable Maps

We are creating a game which is highly moddable. We are allowing users to create their own maps in unreal engine, package them in pak files and later we are mounting their pak files and opening the levels they made in our main project which includes all the functionalities. We have already developed this functionality.

Just checking how the multiplayer would work in their maps. Will the character replication happen on their levels even if their pak files are not included in the server build.

If no, is there any solution for this?