craftbukkit/nms-patches/net/minecraft/world/entity/EntityLightning.patch

--- a/net/minecraft/world/entity/EntityLightning.java
+++ b/net/minecraft/world/entity/EntityLightning.java
@@ -29,6 +29,10 @@
 import net.minecraft.world.phys.AxisAlignedBB;
 import net.minecraft.world.phys.Vec3D;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+// CraftBukkit end
+
 public class EntityLightning extends Entity {
 
     private static final int START_LIFE = 2;
@@ -129,7 +133,7 @@
             }
         }
 
-        if (this.life >= 0) {
+        if (this.life >= 0 && !this.visualOnly) { // CraftBukkit - add !this.visualOnly
             if (!(this.level instanceof WorldServer)) {
                 this.level.setSkyFlashTime(2);
             } else if (!this.visualOnly) {
@@ -163,8 +167,12 @@
             IBlockData iblockdata = BlockFireAbstract.getState(this.level, blockposition);
 
             if (this.level.getBlockState(blockposition).isAir() && iblockdata.canSurvive(this.level, blockposition)) {
-                this.level.setBlockAndUpdate(blockposition, iblockdata);
-                ++this.blocksSetOnFire;
+                // CraftBukkit start - add "!visualOnly"
+                if (!visualOnly && !CraftEventFactory.callBlockIgniteEvent(level, blockposition, this).isCancelled()) {
+                    this.level.setBlockAndUpdate(blockposition, iblockdata);
+                    ++this.blocksSetOnFire;
+                }
+                // CraftBukkit end
             }
 
             for (int j = 0; j < i; ++j) {
@@ -172,8 +180,12 @@
 
                 iblockdata = BlockFireAbstract.getState(this.level, blockposition1);
                 if (this.level.getBlockState(blockposition1).isAir() && iblockdata.canSurvive(this.level, blockposition1)) {
-                    this.level.setBlockAndUpdate(blockposition1, iblockdata);
-                    ++this.blocksSetOnFire;
+                    // CraftBukkit start - add "!visualOnly"
+                    if (!visualOnly && !CraftEventFactory.callBlockIgniteEvent(level, blockposition1, this).isCancelled()) {
+                        this.level.setBlockAndUpdate(blockposition1, iblockdata);
+                        ++this.blocksSetOnFire;
+                    }
+                    // CraftBukkit end
                 }
             }
 
@@ -237,8 +249,9 @@
             iblockdata = world.getBlockState(blockposition1);
         } while (!(iblockdata.getBlock() instanceof WeatheringCopper));
 
+        BlockPosition blockposition1Final = blockposition1; // CraftBukkit - decompile error
         WeatheringCopper.getPrevious(iblockdata).ifPresent((iblockdata1) -> {
-            world.setBlockAndUpdate(blockposition1, iblockdata1);
+            world.setBlockAndUpdate(blockposition1Final, iblockdata1); // CraftBukkit - decompile error
         });
         world.levelEvent(3002, blockposition1, -1);
         return Optional.of(blockposition1);