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

--- a/net/minecraft/world/level/block/BlockPoweredRail.java
+++ b/net/minecraft/world/level/block/BlockPoweredRail.java
@@ -11,6 +11,8 @@
 import net.minecraft.world.level.block.state.properties.BlockStateEnum;
 import net.minecraft.world.level.block.state.properties.IBlockState;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public class BlockPoweredRail extends BlockMinecartTrackAbstract {
 
     public static final BlockStateEnum<BlockPropertyTrackPosition> SHAPE = BlockProperties.RAIL_SHAPE_STRAIGHT;
@@ -113,6 +115,13 @@
         boolean flag1 = world.hasNeighborSignal(blockposition) || this.findPoweredRailSignal(world, blockposition, iblockdata, true, 0) || this.findPoweredRailSignal(world, blockposition, iblockdata, false, 0);
 
         if (flag1 != flag) {
+            // CraftBukkit start
+            int power = flag ? 15 : 0;
+            int newPower = CraftEventFactory.callRedstoneChange(world, blockposition, power, 15 - power).getNewCurrent();
+            if (newPower == power) {
+                return;
+            }
+            // CraftBukkit end
             world.setBlock(blockposition, (IBlockData) iblockdata.setValue(BlockPoweredRail.POWERED, flag1), 3);
             world.updateNeighborsAt(blockposition.below(), this);
             if (((BlockPropertyTrackPosition) iblockdata.getValue(BlockPoweredRail.SHAPE)).isAscending()) {