Versions: (BEFORE SUBMITTING A BUG REPORT, make sure you have the most up-to-date versions of Immersive Weathering, Moonlight Lib and Supplementaries)
Minecraft version: 1.20.1
Immersive Weathering version:1.20.1 2.0.5
Moonlight Lib version:1.20-2.16.5
Supplementaries-1.20-3.1.37
Fabric API / QSL / Forge version: 47.4.0
Logs:

latest.log

To Reproduce:
is just worldgen with Immersive Weathering and lostcities

What about lostcities version?

It was LostCities Version:
1.20-7.4.3