PaperMC/paper-server/nms-patches/net/minecraft/world/level/block/BlockDiodeAbstract.patch

--- a/net/minecraft/world/level/block/BlockDiodeAbstract.java
+++ b/net/minecraft/world/level/block/BlockDiodeAbstract.java
@@ -21,6 +21,8 @@
 import net.minecraft.world.phys.shapes.VoxelShapeCollision;
 import net.minecraft.world.ticks.TickListPriority;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public abstract class BlockDiodeAbstract extends BlockFacingHorizontal {
 
     protected static final VoxelShape SHAPE = Block.box(0.0D, 0.0D, 0.0D, 16.0D, 2.0D, 16.0D);
@@ -56,8 +58,18 @@
             boolean flag1 = this.shouldTurnOn(worldserver, blockposition, iblockdata);
 
             if (flag && !flag1) {
+                // CraftBukkit start
+                if (CraftEventFactory.callRedstoneChange(worldserver, blockposition, 15, 0).getNewCurrent() != 0) {
+                    return;
+                }
+                // CraftBukkit end
                 worldserver.setBlock(blockposition, (IBlockData) iblockdata.setValue(BlockDiodeAbstract.POWERED, false), 2);
             } else if (!flag) {
+                // CraftBukkit start
+                if (CraftEventFactory.callRedstoneChange(worldserver, blockposition, 0, 15).getNewCurrent() != 15) {
+                    return;
+                }
+                // CraftBukkit end
                 worldserver.setBlock(blockposition, (IBlockData) iblockdata.setValue(BlockDiodeAbstract.POWERED, true), 2);
                 if (!flag1) {
                     worldserver.scheduleTick(blockposition, (Block) this, this.getDelay(iblockdata), TickListPriority.VERY_HIGH);