Thanks to the Unreal Slackers Discord Server, I as able to construe that the Rama Victory plugin in general is antiquated and was a hack-fix for earlier versions of the engine. “Load Level Instance (by name)” doesn’t seem compatible with networking.
A quick YT video search proved that the best/most updated node to use for loading stream level is “Load Stream Level”. Tested, and it works! So much easier than relying on the plugin method.
Note: I’m doing the stream level load from a server-replicated event on the game state.