Added debug logging for erroneous rate limit

I still don't know what causes this and I can't reproduce it locally

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

@@ -180,6 +180,12 @@ public class CoreBlock extends StorageBlock{
             }
         }
 
+        @Override
+        public boolean canPickup(){
+            //cores can never be picked up
+            return false;
+        }
+
         @Override
         public void drawLight(){
             Drawf.light(team, x, y, 30f * size, Pal.accent, 0.5f + Mathf.absin(20f, 0.1f));