The game doesn't load the 1.16.100 format version items corectly anymore! Instead it chooses 1.18 and throws all kind of errors bcs of that.

Example from log file!

23:50:22[Json][error]-upgrade items/obsidian/obsidian_axe.json | Failed to upgrade to version '1.18.0' from document version '1.16.100'

23:50:23[Json][error]upgrade items/topaz/topaz_pickaxe.json |  > minecraft:item -> components -> minecraft:enchantable -> value:  missing required field

In the main version of the game 1.20.15 everything works fine!

It stops loading some items from the behaviour pack with the error being about component "minecraft:enchantable" but despite that some items with that component still load fine this can cause issues with a lot of big add-ons and multiple add-on packs! If it makes into the main release a lot of people will get upset with their worlds when items are just gonna dissapear!

Most likely cause!

Probably is something to do with the number of items, I noticed that small packs load the items but not all of them, bigger packs on the other hand don't load most of them.

I'll attach the game log file and the bp used.