**Before filling out this issue: **
1. For major bugs, we only support BYG's latest version on a per Minecraft version basis(i.e latest for 1.15 is 1.0 while latest for 1.16 is 1.1).
2. Please test BYG on its own to confirm whether or not this is a mod conflict

Mod conflict? If so, please clarify which mod is conflicting, if not skip this.

BYG and BetterNether

API/Modloader

Fabric Loader 0.11.1

Describe the bug

With BYG and BetterNether installed, creating a new world (click the "Singleplayer" button) or changing World Type (click the "World Type" button) in single game causes short pause.

To Reproduce

Install Fabric API 0.30.0, BYG 1.1.3, BetterNether 5.0.5; Start the game, create a new world and choose World Type, then this issue happens.

Expected behavior

No more short pause when creating a new world and changing World Types.

Screenshots/Videos

Additional context

Logs

[main/ERROR]: Feature: Not a JSON object: "minecraft:freeze_top_layer"

Heap Dumps
If performance, please provide a heap dump/some sort of profile of your game(I recommend: https://visualvm.github.io/download.html)
Heap Dump/Profile -

This is probably the built in registry being serialized tbh. Other than that it's a little hiccup on performance and that has no real solution other than getting a a better cpu.