I try to copy my current world by right clicking > Copy > Here
It tells me to enter new name, opening copied world give me an empty world (no terrain, no objects)

Perhaps copying worlds is not implemented at the moment

you mean we dont know if it is ?

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if it is not implemented, you can always manually go in the project folder, copy and paste both game and edit folder with the UID name and paste it into the new UID that you "copied".

it works i just tested

Thanks! Yeah it works, if it is just simple copy/paste manually, making copy world feature in editor should be great! Please implement this in the next update, it will become handy