From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 13 May 2023 17:13:40 -0700
Subject: [PATCH] Do not access POI data for lodestone compass

Instead, we can just check the loaded chunk's block position for
the lodestone block, as that is at least safe enough for the light
engine compared to the POI access. This should make it safe for
off-region access.

diff --git a/src/main/java/net/minecraft/world/item/CompassItem.java b/src/main/java/net/minecraft/world/item/CompassItem.java
index 0f3621483a6ddcaeeb25eac51dbfaad41933579a..1086652ae74527c71153053c2e079c1c85d8b5ce 100644
--- a/src/main/java/net/minecraft/world/item/CompassItem.java
+++ b/src/main/java/net/minecraft/world/item/CompassItem.java
@@ -77,7 +77,10 @@ public class CompassItem extends Item implements Vanishable {
                 Optional<ResourceKey<Level>> optional = getLodestoneDimension(compoundTag);
                 if (optional.isPresent() && optional.get() == world.dimension() && compoundTag.contains("LodestonePos")) {
                     BlockPos blockPos = NbtUtils.readBlockPos(compoundTag.getCompound("LodestonePos"));
-                    if (!world.isInWorldBounds(blockPos) || (world.hasChunkAt(blockPos) && !((ServerLevel)world).getPoiManager().existsAtPosition(PoiTypes.LODESTONE, blockPos))) { // Paper - Prevent compass from loading chunks
+                    // Folia start - do not access the POI data off-region
+                    net.minecraft.world.level.chunk.LevelChunk chunk = world.getChunkIfLoaded(blockPos);
+                    if (!world.isInWorldBounds(blockPos) || chunk != null && chunk.getBlockState(blockPos).getBlock() != Blocks.LODESTONE) { // Paper - Prevent compass from loading chunks
+                        // Folia end - do not access the POI data off-region
                         compoundTag.remove("LodestonePos");
                     }
                 }