Make sure to post process chunks before they are sent to players

Some TEs need to be post processed after generation to be sent
properly (chests)

patches/server/Rewrite-chunk-system.patch

@@ -3170,6 +3170,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +                    // the target chunk may not be owned by this region, but this should be resolved in the future
 +                    break;
 +                }
++                if (!chunk.isPostProcessingDone) {
++                    // not yet post-processed, need to do this so that tile entities can properly be sent to clients
++                    chunk.postProcessGeneration();
++                    // check if there was any recursive action
++                    if (this.removed || this.sendQueue.isEmpty() || this.sendQueue.firstLong() != pendingSend) {
++                        return;
++                    } // else: good to dequeue and send, fall through
++                }
 +                this.sendQueue.dequeueLong();
 +
 +                this.sendChunk(pendingSendX, pendingSendZ);