diff --git a/common/src/main/resources/modernfix.accesswidener b/common/src/main/resources/modernfix.accesswidener
index bccdbe43..babf2c36 100644
--- a/common/src/main/resources/modernfix.accesswidener
+++ b/common/src/main/resources/modernfix.accesswidener
@@ -30,4 +30,5 @@ accessible field net/minecraft/server/MinecraftServer resources Lnet/minecraft/s
 accessible class net/minecraft/server/MinecraftServer$ReloadableResources
 accessible method net/minecraft/client/gui/screens/Screen addRenderableWidget (Lnet/minecraft/client/gui/components/events/GuiEventListener;)Lnet/minecraft/client/gui/components/events/GuiEventListener;
 accessible field net/minecraft/client/KeyMapping ALL Ljava/util/Map;
-accessible field net/minecraft/server/packs/resources/MultiPackResourceManager namespacedManagers Ljava/util/Map;
\ No newline at end of file
+accessible field net/minecraft/server/packs/resources/MultiPackResourceManager namespacedManagers Ljava/util/Map;
+accessible field net/minecraft/resources/RegistryOps registryAccess Lnet/minecraft/core/RegistryAccess;
\ No newline at end of file
diff --git a/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/bugfix/removed_dimensions/LevelStorageSourceMixin.java b/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/bugfix/removed_dimensions/LevelStorageSourceMixin.java
new file mode 100644
index 00000000..42514369
--- /dev/null
+++ b/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/bugfix/removed_dimensions/LevelStorageSourceMixin.java
@@ -0,0 +1,27 @@
+package org.embeddedt.modernfix.forge.mixin.bugfix.removed_dimensions;
+
+import com.mojang.datafixers.DataFixer;
+import com.mojang.datafixers.util.Pair;
+import com.mojang.serialization.Dynamic;
+import com.mojang.serialization.DynamicOps;
+import com.mojang.serialization.Lifecycle;
+import net.minecraft.resources.RegistryOps;
+import net.minecraft.world.level.levelgen.WorldGenSettings;
+import net.minecraft.world.level.storage.LevelStorageSource;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(LevelStorageSource.class)
+public class LevelStorageSourceMixin {
+    @Inject(method = "readWorldGenSettings", at = @At(value = "INVOKE", target = "Lcom/mojang/serialization/Codec;parse(Lcom/mojang/serialization/Dynamic;)Lcom/mojang/serialization/DataResult;"))
+    private static <T> void freezeRegistriesBeforeParsing(Dynamic<T> nbt, DataFixer fixer, int version, CallbackInfoReturnable<Pair<WorldGenSettings, Lifecycle>> cir) {
+        DynamicOps<T> var10 = nbt.getOps();
+        if (var10 instanceof RegistryOps<T> ops) {
+            ops.registryAccess.ownedRegistries().forEach((e) -> {
+                e.value().freeze();
+            });
+        }
+    }
+}
diff --git a/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/bugfix/removed_dimensions/RegistryLoaderMixin.java b/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/bugfix/removed_dimensions/RegistryLoaderMixin.java
new file mode 100644
index 00000000..dfa7d4a5
--- /dev/null
+++ b/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/bugfix/removed_dimensions/RegistryLoaderMixin.java
@@ -0,0 +1,27 @@
+package org.embeddedt.modernfix.forge.mixin.bugfix.removed_dimensions;
+
+import com.google.gson.JsonElement;
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.DataResult;
+import com.mojang.serialization.DynamicOps;
+import net.minecraft.core.Holder;
+import net.minecraft.core.Registry;
+import net.minecraft.core.WritableRegistry;
+import net.minecraft.resources.RegistryLoader;
+import net.minecraft.resources.ResourceKey;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(RegistryLoader.class)
+public class RegistryLoaderMixin {
+    @Inject(method = "overrideElementFromResources", at = @At(value = "INVOKE", target = "Lnet/minecraft/core/WritableRegistry;getOrCreateHolder(Lnet/minecraft/resources/ResourceKey;)Lnet/minecraft/core/Holder;", ordinal = 0), cancellable = true)
+    private <E> void handleErroringHolder(WritableRegistry<E> arg, ResourceKey<? extends Registry<E>> arg2, Codec<E> codec, ResourceKey<E> arg3, DynamicOps<JsonElement> dynamicOps, CallbackInfoReturnable<DataResult<Holder<E>>> cir) {
+        try {
+            arg.getOrCreateHolder(arg3);
+        } catch(RuntimeException e) {
+            cir.setReturnValue(DataResult.error("Missing holder for " + arg3));
+        }
+    }
+}