Temporary fix for MC-168329

src/main/java/carpet/CarpetSettings.java

@@ -1127,4 +1127,11 @@ public enum FungusGrowthMode {
             category = {SURVIVAL, FEATURE}
     )
     public static FungusGrowthMode thickFungusGrowth = FungusGrowthMode.FALSE;
+
+    @Rule(
+            desc = "Reset a dimension's weather in every tick if it has no sky light",
+            extra = {"This is intended to fix MC-168329"},
+            category = BUGFIX
+    )
+    public static boolean noWeatherInSkylightlessDimension = false;
 }

src/main/java/carpet/mixins/ServerLevel_noWeatherMixin.java

@@ -0,0 +1,38 @@
+package carpet.mixins;
+
+import java.util.function.Supplier;
+
+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.CallbackInfo;
+
+import carpet.CarpetSettings;
+import net.minecraft.core.Holder;
+import net.minecraft.core.RegistryAccess;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.util.profiling.ProfilerFiller;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.storage.WritableLevelData;
+
+@Mixin(ServerLevel.class)
+public abstract class ServerLevel_noWeatherMixin extends Level {
+
+    protected ServerLevel_noWeatherMixin(WritableLevelData writableLevelData, ResourceKey<Level> resourceKey,
+            RegistryAccess registryAccess, Holder<DimensionType> holder, Supplier<ProfilerFiller> supplier, boolean bl,
+            boolean bl2, long l, int i) {
+        super(writableLevelData, resourceKey, registryAccess, holder, supplier, bl, bl2, l, i);
+    }
+
+    @Inject(method = "advanceWeatherCycle", at = @At("HEAD"))
+    private void resetWeather(CallbackInfo ci) {
+        if (CarpetSettings.noWeatherInSkylightlessDimension && !super.dimensionType().hasSkyLight()) {
+            super.oRainLevel = super.rainLevel;
+            super.oThunderLevel = super.thunderLevel;
+            super.rainLevel = 0;
+            super.thunderLevel = 0;
+        }
+    }
+}

src/main/resources/carpet.mixins.json

@@ -184,7 +184,8 @@
     "ChestBlock_customStickyMixin",
     "HoneyBlock_customStickyMixin",
     "PistonStructureResolver_customStickyMixin",
-    "SlimeBlock_customStickyMixin"
+    "SlimeBlock_customStickyMixin",
+    "ServerLevel_noWeatherMixin"
   ],
   "client": [
     "ClientLevel_tickSpeedMixin",