Revert "Optimize iteration in reference chunk loader"

shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/ReferenceCountingChunkLoader.java

@@ -218,23 +218,11 @@ public class ReferenceCountingChunkLoader {
 
         final ReferenceCountData[] toRemoveTicket = new ReferenceCountData[1];
 
-        final it.unimi.dsi.fastutil.longs.LongIterator sectionsIterator = currentRegion.getOwnedSectionsUnsynchronised();
-        while (sectionsIterator.hasNext()) {
-            final long sectionKey = sectionsIterator.nextLong();
-            final int sectionX = CoordinateUtils.getChunkX(sectionKey);
-            final int sectionZ = CoordinateUtils.getChunkZ(sectionKey);
+        for (ConcurrentChainedLong2ReferenceHashTable.TableEntry<ReferenceCountData> counterEntry : this.referenceCounters.entrySet()) {
+            final long coord = counterEntry.getKey();
+            final ReferenceCountData counterData = counterEntry.getValue();
 
-            final int chunkX = sectionX << this.world.regioniser.sectionChunkShift;
-            final int chunkZ = sectionZ << this.world.regioniser.sectionChunkShift;
-            final long coord = CoordinateUtils.getChunkKey(chunkX, chunkZ);
-            final ReferenceCountData counterData = this.referenceCounters.get(coord);
-
-            // removed
-            if (counterData == null) {
-                continue;
-            }
-
-            // do ttl
+            if (currentRegion == this.world.regioniser.getRegionAtUnsynchronised(CoordinateUtils.getChunkX(coord), CoordinateUtils.getChunkZ(coord))) {
                 long curr = counterData.referenceTTL.get();
                 if (curr == (curr = counterData.referenceTTL.compareAndExchange(curr, curr - 1))) {
                     if (counterData.referenceCount.get() != 0L) {
@@ -262,6 +250,7 @@ public class ReferenceCountingChunkLoader {
                 }
             }
         }
+    }
 
     private static final class ReferenceCountData {