craftbukkit/nms-patches/net/minecraft/world/level/redstone/ExperimentalRedstoneWireEvaluator.patch

--- a/net/minecraft/world/level/redstone/ExperimentalRedstoneWireEvaluator.java
+++ b/net/minecraft/world/level/redstone/ExperimentalRedstoneWireEvaluator.java
@@ -17,6 +17,11 @@
 import net.minecraft.world.level.block.state.properties.BlockPropertyRedstoneSide;
 import net.minecraft.world.level.block.state.properties.BlockStateEnum;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.event.block.BlockRedstoneEvent;
+// CraftBukkit end
+
 public class ExperimentalRedstoneWireEvaluator extends RedstoneWireEvaluator {
 
     private final Deque<BlockPosition> wiresToTurnOff = new ArrayDeque();
@@ -41,7 +46,16 @@
             int j = unpackPower(i);
             IBlockData iblockdata1 = world.getBlockState(blockposition1);
 
-            if (iblockdata1.is((Block) this.wireBlock) && !((Integer) iblockdata1.getValue(BlockRedstoneWire.POWER)).equals(j)) {
+            // CraftBukkit start
+            int oldPower = iblockdata.getValue(BlockRedstoneWire.POWER);
+            if (oldPower != j) {
+                BlockRedstoneEvent event = new BlockRedstoneEvent(CraftBlock.at(world, blockposition1), oldPower, j);
+                world.getCraftServer().getPluginManager().callEvent(event);
+
+                j = event.getNewCurrent();
+            }
+            if (iblockdata1.is((Block) this.wireBlock) && oldPower != j) {
+                // CraftBukkit end
                 int k = 2;
 
                 if (!flag || !flag1) {