Fixed 0th index having pipes after rewinding to that spot

src/bin/flappy/main.rs

@@ -850,11 +850,15 @@ fn manage_batches(
                 PlayerState::Rewind => (curr.saturating_add(2), curr.saturating_sub(2)),
                 _ => (*curr, *curr),
             };
+            if target_batch_id == 0 || new_batch_id == 0 {
+                // skip
+            } else {
                 if target_batch_id != new_batch_id {
                     if let Some(e_old) = batches.iter().find_map(|(e, b)| (b.0 == target_batch_id).then_some(e)) {
                         commands.entity(e_old).insert(Batch(new_batch_id));
                     }
                 }
+            }
         };
     });
 }