Mansions and other structures aren't generated in 1.13.2

[Hecki]

Plugin version: 8.1.0

Spigot username: Hecki

Issue: Mansions and some other srtuctures are not generated on my 1.13.2 server.

Link to settings file (world-settings.json, possibly also biome settings if you have created your own): https://pastebin.com/QdM6urf9