actually works

src/launch/java/baritone/launch/mixins/MixinChunkCache.java

@@ -38,9 +38,21 @@ public class MixinChunkCache {
     private void getBlockState(BlockPos pos, CallbackInfoReturnable<IBlockState> ci) {
         Baritone baritone = (Baritone) BaritoneAPI.getProvider().getPrimaryBaritone();
         IPlayerContext ctx = baritone.getPlayerContext();
-        if (ctx.player() != null && ctx.world() != null && baritone.bsi != null) {
+        if (ctx.player() != null && ctx.world() != null && baritone.bsi != null && Baritone.settings().renderCachedChunks.get()) {
             ci.setReturnValue(baritone.bsi.get0(pos));
-            //ci.setReturnValue(Blocks.DIRT.getDefaultState());
+        }
+    }
+
+    @Inject(
+            method = "isEmpty",
+            at = @At("HEAD"),
+            cancellable = true
+    )
+    private void isEmpty(CallbackInfoReturnable<Boolean> ci) {
+        Baritone baritone = (Baritone) BaritoneAPI.getProvider().getPrimaryBaritone();
+        IPlayerContext ctx = baritone.getPlayerContext();
+        if (ctx.player() != null && ctx.world() != null && baritone.bsi != null && Baritone.settings().renderCachedChunks.get()) {
+            ci.setReturnValue(false);
         }
     }
 }

src/launch/java/baritone/launch/mixins/MixinChunkRenderWorker.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of Baritone.
+ *
+ * Baritone is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Baritone is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Baritone.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package baritone.launch.mixins;
+
+import baritone.Baritone;
+import baritone.api.BaritoneAPI;
+import baritone.api.utils.IPlayerContext;
+import net.minecraft.client.renderer.chunk.ChunkRenderWorker;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+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(ChunkRenderWorker.class)
+public class MixinChunkRenderWorker {
+    @Inject(
+            method = "isChunkExisting",
+            at = @At("HEAD"),
+            cancellable = true
+    )
+    private void isChunkExisting(BlockPos pos, World world, CallbackInfoReturnable<Boolean> ci) {
+        Baritone baritone = (Baritone) BaritoneAPI.getProvider().getPrimaryBaritone();
+        IPlayerContext ctx = baritone.getPlayerContext();
+        if (ctx.player() != null && ctx.world() != null && baritone.bsi != null && Baritone.settings().renderCachedChunks.get()) {
+            ci.setReturnValue(baritone.bsi.isLoaded(pos.getX(), pos.getZ()));
+        }
+    }
+}
+

src/launch/resources/mixins.baritone.json

@@ -13,6 +13,7 @@
     "MixinChunkCache",
     "MixinChunkProviderClient",
     "MixinChunkProviderServer",
+    "MixinChunkRenderWorker",
     "MixinEntity",
     "MixinEntityLivingBase",
     "MixinEntityPlayerSP",