diff --git a/src/main/java/appeng/mixins/spatial/BiomesMixin.java b/src/main/java/appeng/mixins/spatial/BiomesMixin.java
index 8b8eed998..61698c93d 100644
--- a/src/main/java/appeng/mixins/spatial/BiomesMixin.java
+++ b/src/main/java/appeng/mixins/spatial/BiomesMixin.java
@@ -1,13 +1,21 @@
 package appeng.mixins.spatial;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 import net.minecraft.util.registry.BuiltinRegistries;
+import net.minecraft.util.registry.RegistryKey;
+import net.minecraft.world.biome.Biome;
 import net.minecraft.world.biome.Biomes;
 
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+
 import appeng.spatial.SpatialStorageBiome;
 import appeng.spatial.SpatialStorageDimensionIds;
 
@@ -18,10 +26,21 @@ import appeng.spatial.SpatialStorageDimensionIds;
 @Mixin(Biomes.class)
 public class BiomesMixin {
 
+    @Unique
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    @Shadow
+    private static Int2ObjectMap<RegistryKey<Biome>> BIOMES;
+
     @Inject(method = "<clinit>", at = @At("TAIL"))
     private static void registerBiomes(CallbackInfo ci) {
         BuiltinRegistries.add(BuiltinRegistries.BIOME, SpatialStorageDimensionIds.BIOME_KEY.getValue(),
                 SpatialStorageBiome.INSTANCE);
+        int rawId = BuiltinRegistries.BIOME.getRawId(SpatialStorageBiome.INSTANCE);
+        RegistryKey<Biome> prev = BIOMES.put(rawId, SpatialStorageDimensionIds.BIOME_KEY);
+        if (prev != null) {
+            LOGGER.warn("Biome with raw-id {} was already registered: {}", rawId, prev);
+        }
     }
 
 }