Describe the bug
When I try to load a modpack that has both Full Slabs and Very Many Players, the world crashes before I can select a world. VMP was in the modpack first, and after Full Slabs was added the crashes began. However, Full Slabs worked on its own and with all other mods in the pack, and every other mod from the pack proved to be compatible with Full Slabs (I added them back one by one after testing it by itself).

To make sure it was these two mods and nothing else, I put them in my own test modpack consisting of Cloth Config v11 (11.1.118), Fabric API (0.91.0+1.20.1), Full Slabs (3.4.0), and Very Many Players (0.2.0+beta.7.102), and this consistently crashed upon clicking the 'select world' button.

To Reproduce
Steps to reproduce the behavior:

1. Do something
2. See error

Expected behavior

Screenshots

Runtime info (please complete the following information):

• OS: macOS Ventura 13.2.1 (however, a friend using a Linux computer experienced the exact same crash with the same original modpack)
• Minecraft version: 1.20.1
• Mod version: 0.2.0+beta.7.102

Crash reports / logs
(https://gist.github.com/RechercheRaptor/047f59289b6244b1a131ff676f022bb5)

Other mods
Full Slabs 3.4.0 0.91.0+1.20.1
Fabric API
Cloth Config v11 11.1.118

Checklist

• [ x ] I am using the official version of the mod.
• [ x ] I tried the latest development version but the issue persists.
• [ x ] I searched for similar open issues and could not find an existing bug report on this.