When creating a new world with the new 0.4.7.28 version for 1.18.2 I get the "Errors in currently selected datapacks prevented the world from loading." message along with 2 errors in the log when attempting to create a new world.
Using Forge 40.1.54

Errors: https://pastebin.com/5b3MdHs8

Full log: latest.log

not sure if it helps, but i'm also having this issue. "mysticalworld:quicksilver_ingot does not exist"

Full Log: latest.log
Debug Log: debug.log

I am trying to add it to "The Lighthouse" modpack
https://www.curseforge.com/minecraft/modpacks/the-lighthouse

Mystical World: mysticalworld-1.18.2-0.4.7.28.jar
Minecraft: 1.18.2
Forge: 40.1.54

It looks like a compatibility recipe from another mod is failing to load. @IAnon, could you post a list of the mods you were trying to launch with?

Hello, I was having the same problem but narrowed it down to the Create mod having compat files for mystical world quicksilver. As mystical world doesn't have quicksilver in the 1.18.2 version, I deleted the files from Create and now it works. Sorry for rambling, I'm very new to this.

Sorry for the late reply but it does look like create is the culprit as Prof-Mole said, disabling it makes mystical world work.
Here is my mod list if still relevant.
https://pastebin.com/uFXpnaTb

great job, team! excellent hunting!