Multiverse creates new world but doesn’t appear in worlds tab in aternos

So basically I used the /mvtp command in my modded 1.12.2 server with plugins. On my normal vanilla server, when I used the command there would be a new world in the worlds tab in the server, but when I tried it in my 1.12.2 server. There was only 1 world, which was the original. Don’t know what went wrong. Thanks in advance.

Ok so for some reason it created the world inside the original world folder. But I want to import Stampy’s lovely world to the newly created world. Any way I can make it not be created in the world’s files?

I use spigot 1.19.3, plus I don’t understand what you’re saying about the sub world stuff