PaperMC/Spigot-Server-Patches/0510-Fix-sand-duping.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Fri, 12 Jun 2020 13:33:19 -0700
Subject: [PATCH] Fix sand duping

If the falling block dies during teleportation (entity#move), then we need
to detect that by placing a check after the move.

diff --git a/src/main/java/net/minecraft/server/EntityFallingBlock.java b/src/main/java/net/minecraft/server/EntityFallingBlock.java
index 40ab0a1e5b8e31f1ef3b2444366784a65f034341..6697b94550054ebbc8d4b3761bd9f36eb7e4ba8a 100644
--- a/src/main/java/net/minecraft/server/EntityFallingBlock.java
+++ b/src/main/java/net/minecraft/server/EntityFallingBlock.java
@@ -64,6 +64,11 @@ public class EntityFallingBlock extends Entity {
 
     @Override
     public void tick() {
+        // Paper start - fix sand duping
+        if (this.dead) {
+            return;
+        }
+        // Paper end - fix sand duping
         if (this.block.isAir()) {
             this.die();
         } else {
@@ -86,6 +91,12 @@ public class EntityFallingBlock extends Entity {
 
             this.move(EnumMoveType.SELF, this.getMot());
 
+            // Paper start - fix sand duping
+            if (this.dead) {
+                return;
+            }
+            // Paper end - fix sand duping
+
             // Paper start - Configurable EntityFallingBlock height nerf
             if (this.world.paperConfig.fallingBlockHeightNerf != 0 && this.locY() > this.world.paperConfig.fallingBlockHeightNerf) {
                 if (this.dropItem && this.world.getGameRules().getBoolean(GameRules.DO_ENTITY_DROPS)) {