fix: deploy core block position getting changed by minecraft (prediction)

src/main/java/land/chipmunk/chipmunkmod/mixin/ClientWorldAccessor.java

@@ -0,0 +1,12 @@
+package land.chipmunk.chipmunkmod.mixin;
+
+import net.minecraft.client.network.PendingUpdateManager;
+import net.minecraft.client.world.ClientWorld;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(ClientWorld.class)
+public interface ClientWorldAccessor {
+    @Accessor(value = "pendingUpdateManager")
+    PendingUpdateManager getPendingUpdateManager ();
+}

src/main/java/land/chipmunk/chipmunkmod/modules/CommandCore.java

@@ -4,6 +4,7 @@ import it.unimi.dsi.fastutil.objects.Object2ObjectArrayMap;
 import land.chipmunk.chipmunkmod.ChipmunkMod;
 import land.chipmunk.chipmunkmod.listeners.Listener;
 import land.chipmunk.chipmunkmod.listeners.ListenerManager;
+import land.chipmunk.chipmunkmod.mixin.ClientWorldAccessor;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.CommandBlock;
@@ -14,6 +15,7 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.network.ClientPlayNetworkHandler;
 import net.minecraft.client.network.ClientPlayerEntity;
 import net.minecraft.client.network.ClientPlayerInteractionManager;
+import net.minecraft.client.network.PendingUpdateManager;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.component.ComponentMap;
 import net.minecraft.component.DataComponentTypes;
@@ -24,6 +26,7 @@ import net.minecraft.item.Items;
 import net.minecraft.nbt.NbtCompound;
 import net.minecraft.network.ClientConnection;
 import net.minecraft.network.packet.c2s.play.CreativeInventoryActionC2SPacket;
+import net.minecraft.network.packet.c2s.play.PlayerInteractBlockC2SPacket;
 import net.minecraft.network.packet.c2s.play.UpdateCommandBlockC2SPacket;
 import net.minecraft.network.packet.c2s.play.UpdateSelectedSlotC2SPacket;
 import net.minecraft.registry.Registries;
@@ -453,6 +456,19 @@ public class CommandCore implements Listener {
         }
 
         interactionManager.breakBlock(position);
+        try (final PendingUpdateManager pendingUpdateManager = ((ClientWorldAccessor) world).getPendingUpdateManager()) {
+            connection.send(
+                    new PlayerInteractBlockC2SPacket(
+                            Hand.MAIN_HAND,
+                            BlockHitResult.createMissed(
+                                    new Vec3d(position),
+                                    Direction.UP,
+                                    position
+                            ),
+                            pendingUpdateManager.incrementSequence().getSequence()
+                    )
+            );
+        }
         interactionManager.interactBlock(
                 player,
                 Hand.MAIN_HAND,

src/main/resources/chipmunkmod.mixins.json

@@ -10,6 +10,7 @@
     "ClientConnectionMixin",
     "ClientPlayerEntityMixin",
     "ClientPlayNetworkHandlerMixin",
+    "ClientWorldAccessor",
     "MinecraftClientAccessor",
     "StringHelperMixin",
     "ElderGuardianAppearanceParticleMixin",