diff --git a/fabric/testmod/build.gradle b/fabric/testmod/build.gradle
index 8e27f9b9..8fa9f8a2 100644
--- a/fabric/testmod/build.gradle
+++ b/fabric/testmod/build.gradle
@@ -16,6 +16,7 @@ dependencies {
     modImplementation "net.fabricmc:fabric-loader:${rootProject.fabric_loader_version}"
     modImplementation(fabricApi.module("fabric-resource-loader-v0", rootProject.fabric_api_version)) { exclude group: 'net.fabricmc', module: 'fabric-loader' }
     modImplementation(fabricApi.module("fabric-models-v0", rootProject.fabric_api_version)) { exclude group: 'net.fabricmc', module: 'fabric-loader' }
+    modImplementation(fabricApi.module("fabric-registry-sync-v0", rootProject.fabric_api_version)) { exclude group: 'net.fabricmc', module: 'fabric-loader' }
     modImplementation(fabricApi.module("fabric-renderer-api-v1", rootProject.fabric_api_version)) { exclude group: 'net.fabricmc', module: 'fabric-loader' }
     modRuntimeOnly(fabricApi.module("fabric-renderer-indigo", rootProject.fabric_api_version)) { exclude group: 'net.fabricmc', module: 'fabric-loader' }
 
diff --git a/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/client/TestModClient.java b/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/client/TestModClient.java
index 3bf0c36a..24f9dbb9 100644
--- a/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/client/TestModClient.java
+++ b/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/client/TestModClient.java
@@ -2,6 +2,7 @@ package org.embeddedt.modernfix.testmod.client;
 
 import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.fabric.api.client.model.ModelLoadingRegistry;
+import net.minecraft.client.Minecraft;
 import org.embeddedt.modernfix.testmod.TestMod;
 
 import java.util.regex.Matcher;
@@ -23,5 +24,7 @@ public class TestModClient implements ClientModInitializer {
             }
             return null;
         });
+        // needed to make debug level rendering work correctly
+        Minecraft.getInstance().smartCull = false;
     }
 }
diff --git a/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/mixin/DebugLevelSourceMixin.java b/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/mixin/DebugLevelSourceMixin.java
index 40d3eba9..38301fa1 100644
--- a/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/mixin/DebugLevelSourceMixin.java
+++ b/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/mixin/DebugLevelSourceMixin.java
@@ -1,9 +1,12 @@
 package org.embeddedt.modernfix.testmod.mixin;
 
 import net.minecraft.core.BlockPos;
-import net.minecraft.server.level.WorldGenRegion;
+import net.minecraft.core.SectionPos;
+import net.minecraft.world.level.ChunkPos;
 import net.minecraft.world.level.StructureFeatureManager;
+import net.minecraft.world.level.WorldGenLevel;
 import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.chunk.ChunkAccess;
 import net.minecraft.world.level.levelgen.DebugLevelSource;
 import org.embeddedt.modernfix.testmod.TestMod;
 import org.spongepowered.asm.mixin.Mixin;
@@ -14,20 +17,21 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 @Mixin(DebugLevelSource.class)
 public class DebugLevelSourceMixin {
     @Inject(method = "applyBiomeDecoration", at = @At("HEAD"), cancellable = true)
-    private void showColorCube(WorldGenRegion region, StructureFeatureManager structureManager, CallbackInfo ci) {
+    private void showColorCube(WorldGenLevel level, ChunkAccess chunk, StructureFeatureManager structureFeatureManager, CallbackInfo ci) {
         ci.cancel();
         BlockPos.MutableBlockPos mutableBlockPos = new BlockPos.MutableBlockPos();
-        int i = region.getCenterX();
-        int j = region.getCenterZ();
+        ChunkPos chunkPos = chunk.getPos();
+        int i = chunkPos.x;
+        int j = chunkPos.z;
 
         for(int k = 0; k < 16; ++k) {
             for(int l = 0; l < 16; ++l) {
-                int m = (i << 4) + k;
-                int n = (j << 4) + l;
+                int m = SectionPos.sectionToBlockCoord(i, k);
+                int n = SectionPos.sectionToBlockCoord(j, l);
                 for(int y = 0; y < 255; y++) {
                     BlockState blockState = TestMod.getColorCubeStateFor(m, y, n);
                     if (blockState != null) {
-                        region.setBlock(mutableBlockPos.set(m, y, n), blockState, 2);
+                        level.setBlock(mutableBlockPos.set(m, y, n), blockState, 2);
                     }
                 }
             }
diff --git a/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/mixin/RenderChunkMixin.java b/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/mixin/RenderChunkMixin.java
new file mode 100644
index 00000000..eaa6d1d2
--- /dev/null
+++ b/fabric/testmod/src/main/java/org/embeddedt/modernfix/testmod/mixin/RenderChunkMixin.java
@@ -0,0 +1,23 @@
+package org.embeddedt.modernfix.testmod.mixin;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.block.state.BlockState;
+import org.embeddedt.modernfix.testmod.TestMod;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(targets = { "net/minecraft/client/renderer/chunk/RenderChunk" })
+public class RenderChunkMixin {
+    @Shadow @Final private boolean debug;
+
+    @Inject(method = "getBlockState", at = @At("HEAD"), cancellable = true)
+    private void redirectDebugWorld(BlockPos pos, CallbackInfoReturnable<BlockState> cir) {
+        if(this.debug) {
+            cir.setReturnValue(TestMod.getColorCubeStateFor(pos.getX(), pos.getY(), pos.getZ()));
+        }
+    }
+}
diff --git a/fabric/testmod/src/main/resources/testmod.mixins.json b/fabric/testmod/src/main/resources/testmod.mixins.json
index 9eeb91ea..46222aa3 100644
--- a/fabric/testmod/src/main/resources/testmod.mixins.json
+++ b/fabric/testmod/src/main/resources/testmod.mixins.json
@@ -7,6 +7,9 @@
     "ChunkMixin",
     "DebugLevelSourceMixin"
   ],
+  "client": [
+    "RenderChunkMixin"
+  ],
   "injectors": {
     "defaultRequire": 1
   }