I didn't know why I didn't ever told it:

I did a few multiplayer projects in Unity 4 Engine (beloved old multiplayer) and I wanted to create a custom dedicated server within the Unity engine.

I created a new project and started programming. The clients even connected to the server but I couldn't figure out how to sync the world's because the blocks the world was made of existed in both projects,but had different IDs (didn't knew there were IDs).

After a bit of googling I found out that it isn't possible to sync these projects. Tired of myself giving up I tried a different route and found out that these IDs would sync of you exported them as asset pack. So I did!

And it worked ❤️❤️❤️❤️

So I could have a less power heavy dedicated within the unity engine.

(PS: I knew I just could made a server in C# or so with sockets and what ever, but 12 year old me doesn't knew sockets)