Fixed #8507

core/src/mindustry/world/blocks/payloads/PayloadConveyor.java

@@ -33,6 +33,7 @@ public class PayloadConveyor extends Block{
         priority = TargetPriority.transport;
         envEnabled |= Env.space | Env.underwater;
         sync = true;
+        underBullets = true;
     }
 
     @Override

core/src/mindustry/world/blocks/storage/CoreBlock.java

@@ -492,6 +492,12 @@ public class CoreBlock extends StorageBlock{
 
             storageCapacity = itemCapacity + proximity().sum(e -> owns(e) ? e.block.itemCapacity : 0);
             proximity.each(this::owns, t -> {
+                //add inventory if there is something in it from a payload
+                if(t.items != items){
+                    items.add(t.items);
+                    t.items.clear();
+                }
+
                 t.items = items;
                 ((StorageBuild)t).linkedCore = this;
             });