I'm having a similar problem and i'm not have optifine.
The midpack consiste of this mods:
powah
cyclops core
mause tweaks
valkirie lib
simple generators
Lolipop
JEI
everlasting abilities
Attribute fix
Just Enought Resources
Apple skin
Easy villagers
Fast leaf decay
Waystone
refined storage
Easy piglins
The vault
Dank storage
Storage drawers
i created the modpack without The Vault mod (because i'm stupid and forgot about the most important mod)
and i could create a world and reload anytime i wanted
but when i installed the Vault mod i couyln't enter on my old world or create another one
i can't create a pastebin cause it's too long, if you have an idea what i should look for i may try to shortened it on that bit
errors i've found
https://pastebin.com/RqrVXijz
and many others all related to the Vault mod
something i can try:
installing the original modpack and removing the mods i'm not interested with and adding everlasting abilities (the only mod i have and it's not on the original modpack) (Nope the original modpack give me another type of error TT)
Recreating the modpack from scratch starting with The Vault mod and adding mods one at time (nope still have error)
give up on The Vault mod lol
Edit1:
even having ONLY the Vault mod it has the same issue
is it possible that i have to manully set up all the loot tables for all the different chest loot table inside the Vault?
well, even if i do, there are still problem with the puzle room as far as i understand on the log
