Fix chunk fixer

SpigotCore_Main/src/de/steamwar/core/events/PartialChunkFixer.java

@@ -23,9 +23,14 @@ import com.comphenix.tinyprotocol.Reflection;
 import com.comphenix.tinyprotocol.TinyProtocol;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.ViaAPI;
+import de.steamwar.core.Core;
 import de.steamwar.core.CraftbukkitWrapper;
+import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * TinyProtocol can't translate BlockEntities during 1.16 to 1.17 conversions du to removed partial chunk update support. This class cancels PartialChunkUpdates for this players and sends them a complete chunk instead.
  * This class can only be loaded on 1.9 to 1.15 with active ViaVersion.
@@ -40,16 +45,40 @@ public class PartialChunkFixer {
 
     private final ViaAPI<Player> via = Via.getAPI();
 
+    private final List<ResendChunk> chunksToResend = new ArrayList<>();
+
     public PartialChunkFixer() {
         TinyProtocol.instance.addFilter(mapChunk, this::chunkFilter);
+        Bukkit.getScheduler().runTaskTimer(Core.getInstance(), () -> {
+            synchronized (chunksToResend) {
+                for(ResendChunk chunk : chunksToResend) {
+                    CraftbukkitWrapper.impl.sendChunk(chunk.player, chunk.x, chunk.z);
+                }
+                chunksToResend.clear();
+            }
+        }, 1, 1);
     }
 
     private Object chunkFilter(Player player, Object packet) {
         if(via.getPlayerVersion(player) >= PROTOCOL1_17 && !fullChunkFlag.get(packet)) {
             // partial chunk update
-            CraftbukkitWrapper.impl.sendChunk(player, chunkX.get(packet), chunkZ.get(packet));
+            synchronized (chunksToResend) {
+                chunksToResend.add(new ResendChunk(player, chunkX.get(packet), chunkZ.get(packet)));
+            }
             return null;
         }
         return packet;
     }
+
+    private static class ResendChunk {
+        private final Player player;
+        private final int x;
+        private final int z;
+
+        private ResendChunk(Player player, int x, int z) {
+            this.player = player;
+            this.x = x;
+            this.z = z;
+        }
+    }
 }