Destruction states will now reset when breaking/replacing the block

src/main/java/com/minelittlepony/unicopia/BlockDestructionManager.java

@@ -5,6 +5,7 @@ import com.minelittlepony.unicopia.network.MsgBlockDestruction;
 
 import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+import net.minecraft.block.BlockState;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
@@ -49,6 +50,12 @@ public class BlockDestructionManager {
         return amount;
     }
 
+    public void onBlockChanged(BlockPos pos, BlockState oldState, BlockState newstate) {
+        if (oldState.getBlock() != newstate.getBlock()) {
+            clearBlockDestruction(pos);
+        }
+    }
+
     public void tick() {
         synchronized (locker) {
             destructions.long2ObjectEntrySet().removeIf(entry -> entry.getValue().tick());

src/main/java/com/minelittlepony/unicopia/mixin/MixinServerWorld.java

@@ -0,0 +1,23 @@
+package com.minelittlepony.unicopia.mixin;
+
+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 com.minelittlepony.unicopia.BlockDestructionManager;
+import net.minecraft.block.BlockState;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.StructureWorldAccess;
+import net.minecraft.world.World;
+
+@Mixin(ServerWorld.class)
+abstract class MixinServerWorld extends World implements StructureWorldAccess {
+    private MixinServerWorld() {super(null, null, null, null, false, false, 0);}
+
+    @Inject(method = "onBlockChanged", at = @At("HEAD"))
+    private void onOnBlockChanged(BlockPos pos, BlockState oldState, BlockState newState, CallbackInfo info) {
+        ((BlockDestructionManager.Source)this).getDestructionManager().onBlockChanged(pos, oldState, newState);
+    }
+}

src/main/resources/unicopia.mixin.json

@@ -16,6 +16,7 @@
     "MixinPlayerEntity",
     "MixinProjectileEntity",
     "MixinServerPlayerEntity",
+    "MixinServerWorld",
     "MixinSheepEntity",
     "MixinShulkerEntity",
     "MixinTargetPredicate",