From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Thu, 24 Jun 2021 01:42:35 +0100
Subject: [PATCH] Allow explosions under 0 height

Upstream forgot to update the check here which prevents explosions
occuring under 0 height, however, vanilla already checks that we
are in bounds of the world above this, so this call is entirely
redundant.

diff --git a/src/main/java/net/minecraft/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
index d4785160c1477ed13343e30c913b08175011d048..fb50ee3daba9f4fe8cc173c209521679a59f23d7 100644
--- a/src/main/java/net/minecraft/world/level/Explosion.java
+++ b/src/main/java/net/minecraft/world/level/Explosion.java
@@ -190,7 +190,7 @@ public class Explosion {
                                 f -= ((Float) optional.get() + 0.3F) * 0.3F;
                             }
 
-                            if (f > 0.0F && this.damageCalculator.shouldBlockExplode(this, this.level, blockposition, iblockdata, f) && blockposition.getY() < 256 && blockposition.getY() >= 0) { // CraftBukkit - don't wrap explosions
+                            if (f > 0.0F && this.damageCalculator.shouldBlockExplode(this, this.level, blockposition, iblockdata, f)/* && blockposition.getY() < 256 && blockposition.getY() >= 0*/) { // CraftBukkit - don't wrap explosions // Paper - permit < 0
                                 set.add(blockposition);
                                 // Paper start - prevent headless pistons from forming
                                 if (!com.destroystokyo.paper.PaperConfig.allowHeadlessPistons && iblockdata.getBlock() == Blocks.MOVING_PISTON) {