I tried importing the resource .uassets to a seperate project to see what was inside them, but that didn't work. I guess it's an older UE4 version or something, but I couldn't see what version inside the raw .uasset file unfortunately.
Has anyone figured out how to open the .uasset files? Or even found the actual .umap files and opened them? I bet that's where the resource spawning is. As far as I could tell, it wasn't a part of any of the server config files, so it must be hardbaked into those blueprints somehow.