Version: 1.20.1
Loader: Quilt on Curseforge
Crash report pastebin
Issue:
Minecraft crashes upon attempting to create a new world with error
" java.lang.IllegalStateException: Item: modern_industrialization:platinum_block does not exist "

Modern industrialization was not installed at the time, I would prefer it to not be installed

Looks like you still have recipes that refer to MI blocks. You'll have to remove the offending data packs.