Paper-Old/nms-patches/BlockIce.patch

--- a/net/minecraft/server/BlockIce.java
+++ b/net/minecraft/server/BlockIce.java
@@ -44,6 +44,12 @@
 
     public void b(World world, BlockPosition blockposition, IBlockData iblockdata, Random random) {
         if (world.b(EnumSkyBlock.BLOCK, blockposition) > 11 - this.p()) {
+            // CraftBukkit start
+            if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()), world.worldProvider.n() ? Blocks.AIR : Blocks.WATER).isCancelled()) {
+                return;
+            }
+            // CraftBukkit end
+            
             if (world.worldProvider.n()) {
                 world.setAir(blockposition);
             } else {