Paper/patches/server/0494-Remove-stale-POIs.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sat, 9 Jan 2021 14:17:07 +0100
Subject: [PATCH] Remove stale POIs


diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index a668e204946943bcc963ad41ea3029111267eef9..b93976abbc98c1beffe4b464735c9b5a71cb45a4 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1795,6 +1795,11 @@ public class ServerLevel extends Level implements WorldGenLevel {
             });
             optional1.ifPresent((holder) -> {
                 this.getServer().execute(() -> {
+                    // Paper start - Remove stale POIs
+                    if (optional.isEmpty() && this.getPoiManager().exists(blockposition1, poiType -> true)) {
+                        this.getPoiManager().remove(blockposition1);
+                    }
+                    // Paper end - Remove stale POIs
                     this.getPoiManager().add(blockposition1, holder);
                     DebugPackets.sendPoiAddedPacket(this, blockposition1);
                 });