Hello,

There seems to be a recipe issue with the 12.0.2 release.

[10:51:29] [main/ERROR] [minecraft/RecipeManager]: Parsing error loading recipe storagedrawers:conversion_upgrade
com.google.gson.JsonSyntaxException: Unknown item 'storagedrawers:conversion_upgrade'
at net.minecraftforge.common.crafting.CraftingHelper.getItem(CraftingHelper.java:160) ~[forge-1.20.1-47.1.3-universal.jar%23120!/:?] {re:classloading}

Yes，I also encountered this error on the server with the 12.0.2 release.

I think it's because the registration code was not removed.

[13:36:38] [main/ERROR] [minecraft/RecipeManager]: Parsing error loading recipe storagedrawers:conversion_upgrade
com.google.gson.JsonSyntaxException: Unknown item 'storagedrawers:conversion_upgrade'
at net.minecraftforge.common.crafting.CraftingHelper.getItem(CraftingHelper.java:160) ~[forge-1.20.1-47.1.0-universal.jar%23188!/:?] {re:mixin,re:classloading,pl:mixin:A}
at net.minecraftforge.common.crafting.CraftingHelper.getItemStack(CraftingHelper.java:186) ~[forge-1.20.1-47.1.0-universal.jar%23188!/:?] {re:mixin,re:classloading,pl:mixin:A}
at net.minecraft.world.item.crafting.ShapedRecipe.m_151274_(ShapedRecipe.java:286) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:bookshelf.common.mixins.json:accessors.item.crafting.AccessorShapedRecipe,pl:mixin:A}
at net.minecraft.world.item.crafting.ShapedRecipe$Serializer.m_6729_(ShapedRecipe.java:311) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:classloading}
at net.minecraft.world.item.crafting.ShapedRecipe$Serializer.m_6729_(ShapedRecipe.java:301) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:classloading}
at net.minecraftforge.common.extensions.IForgeRecipeSerializer.fromJson(IForgeRecipeSerializer.java:23) ~[forge-1.20.1-47.1.0-universal.jar%23188!/:?] {re:classloading}
at net.minecraft.world.item.crafting.RecipeManager.fromJson(RecipeManager.java:171) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.world.item.crafting.RecipeManager.m_5787_(RecipeManager.java:67) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.world.item.crafting.RecipeManager.m_5787_(RecipeManager.java:34) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.packs.resources.SimplePreparableReloadListener.m_10789_(SimplePreparableReloadListener.java:13) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:mixin,re:computing_frames,re:classloading}
at java.util.concurrent.CompletableFuture$UniAccept.tryFire(Unknown Source) ~[?:?] {}
at java.util.concurrent.CompletableFuture$Completion.run(Unknown Source) ~[?:?] {}
at net.minecraft.server.packs.resources.SimpleReloadInstance.m_143940_(SimpleReloadInstance.java:69) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:classloading}
at net.minecraft.Util.m_214652_(Util.java:783) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:classloading}
at net.minecraft.Util.m_214679_(Util.java:772) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:classloading}
at net.minecraft.server.Main.main(Main.java:166) ~[server-1.20.1-20230612.114412-srg.jar%23183!/:?] {re:mixin,re:classloading,pl:mixin:APP:create.mixins.json:MainMixin,pl:mixin:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?] {}
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.1.0.jar%2369!/:?] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.serverService(CommonLaunchHandler.java:103) ~[fmlloader-1.20.1-47.1.0.jar%2369!/:?] {}
at net.minecraftforge.fml.loading.targets.CommonServerLaunchHandler.lambda$makeService$0(CommonServerLaunchHandler.java:27) ~[fmlloader-1.20.1-47.1.0.jar%2369!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar%2355!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar%2355!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar%2355!/:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar%2355!/:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar%2355!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar%2355!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar%2355!/:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}

Aye, the issue still exist on the latest 1.20.1 version