I created a server on Aternos and there was a pier TerraFirmaCraft but when starting the server on the server, the normal generation and not the mod, then I found out that I need to enter the name of the generation of the mod PLEASE SAY THE NAME OF THE GENERATION OF THE WORLD FASHION

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That said, in 1.12 the level-type is tfc:classic and in 1.18 tfc:tng.