Add dropped hunk from mid-tick tasks (#7034)

patches/server/Optimise-chunk-tick-iteration.patch

@@ -102,5 +102,5 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 -            gameprofilerfiller.pop();
 +            //  Paper - no, iterating just ONCE is expensive enough! Don't do it TWICE! Code moved up
              gameprofilerfiller.pop();
-             // Paper start - controlled flush for entity tracker packets
-             List<net.minecraft.network.Connection> disabledFlushes = new java.util.ArrayList<>(this.level.players.size());
+             this.chunkMap.tick();
+         }