CatServer/patches/net/minecraft/world/gen/feature/WorldGenMegaJungle.java.patch

--- ../src-base/minecraft/net/minecraft/world/gen/feature/WorldGenMegaJungle.java
+++ ../src-work/minecraft/net/minecraft/world/gen/feature/WorldGenMegaJungle.java
@@ -55,7 +55,7 @@
             {
                 BlockPos blockpos = position.up(i2);
 
-                if (this.canGrowInto(worldIn.getBlockState(blockpos).getBlock()))
+                if (this.isAirLeaves(worldIn,blockpos))
                 {
                     this.setBlockAndNotifyAdequately(worldIn, blockpos, this.woodMetadata);
 
@@ -70,7 +70,7 @@
                 {
                     BlockPos blockpos1 = blockpos.east();
 
-                    if (this.canGrowInto(worldIn.getBlockState(blockpos1).getBlock()))
+                    if (this.isAirLeaves(worldIn,blockpos1))
                     {
                         this.setBlockAndNotifyAdequately(worldIn, blockpos1, this.woodMetadata);
 
@@ -83,7 +83,7 @@
 
                     BlockPos blockpos2 = blockpos.south().east();
 
-                    if (this.canGrowInto(worldIn.getBlockState(blockpos2).getBlock()))
+                    if (this.isAirLeaves(worldIn,blockpos2))
                     {
                         this.setBlockAndNotifyAdequately(worldIn, blockpos2, this.woodMetadata);
 
@@ -96,7 +96,7 @@
 
                     BlockPos blockpos3 = blockpos.south();
 
-                    if (this.canGrowInto(worldIn.getBlockState(blockpos3).getBlock()))
+                    if (this.isAirLeaves(worldIn,blockpos3))
                     {
                         this.setBlockAndNotifyAdequately(worldIn, blockpos3, this.woodMetadata);
 
@@ -130,4 +130,11 @@
             this.growLeavesLayerStrict(worldIn, p_175930_2_.up(j), p_175930_3_ + 1 - j);
         }
     }
+
+    //Helper macro
+    private boolean isAirLeaves(World world, BlockPos pos)
+    {
+        IBlockState state = world.getBlockState(pos);
+        return state.getBlock().isAir(state, world, pos) || state.getBlock().isLeaves(state, world, pos);
+    }
 }