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

--- a/net/minecraft/world/level/block/BlockNylium.java
+++ b/net/minecraft/world/level/block/BlockNylium.java
@@ -31,6 +31,11 @@
     @Override
     public void randomTick(IBlockData iblockdata, WorldServer worldserver, BlockPosition blockposition, Random random) {
         if (!canBeNylium(iblockdata, worldserver, blockposition)) {
+            // CraftBukkit start
+            if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(worldserver, blockposition, Blocks.NETHERRACK.defaultBlockState()).isCancelled()) {
+                return;
+            }
+            // CraftBukkit end
             worldserver.setBlockAndUpdate(blockposition, Blocks.NETHERRACK.defaultBlockState());
         }