UICollectionView cell rotation

Hello, I'm building chat app, and also using CoreData to store messages.

I have rotated my collectionView, so that it looks like it's going bottom to up.

I have rotated my collectionView in viewDidLoad()

override func viewDidLoad() {
        super.viewDidLoad()
        
        msgsCollectionView.delegate = self
        msgsCollectionView.dataSource = self
        
        //observeUserMessages()
        
        //rotate collectionView 180º
        msgsCollectionView.transform = CGAffineTransform.init(rotationAngle: (-(CGFloat)(Double.pi)))
        //move scroll indicator from right to left
        msgsCollectionView.scrollIndicatorInsets = UIEdgeInsets.init(top: 0, left: 0, bottom: 0, right: msgsCollectionView.bounds.size.width - 7)
        
        attemptFetch()
        
    }

Then, I have rotated each cell in cellForRowAt

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        
        let message = controller.object(at: indexPath)
        
        if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MessageCell", for: indexPath) as? MessageCell {
            
            cell.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
            
            if let messageText = message.text {
                let size = CGSize(width: 250, height: 1000)
                let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
                let estimatedFrame = NSString(string: messageText).boundingRect(with: size, options: options, attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 14), NSAttributedString.Key.foregroundColor: UIColor.darkGray], context: nil)
                
                if !message.isSender {
                    cell.msgTextView.frame = CGRect(x: 8, y: 0, width: estimatedFrame.width + 16, height: estimatedFrame.height + 18)
                    cell.textBubbleView.frame = CGRect(x: 0, y: 0, width: estimatedFrame.width + 16 + 8, height: estimatedFrame.height + 20)
                } else {
                    cell.msgTextView.frame = CGRect(x: collectionView.frame.width - estimatedFrame.width - 16 - 8, y: 0, width: estimatedFrame.width + 16, height: estimatedFrame.height + 18)
                    cell.textBubbleView.frame = CGRect(x: collectionView.frame.width - estimatedFrame.width - 16 - 8 - 8, y: 0, width: estimatedFrame.width + 16 + 8, height: estimatedFrame.height + 20)
                }
            }
            cell.configureCell(msg: message)
            
            return cell
        } else {
            return MessageCell()
        }

My problem is when I send a new message, the cells get reload and animated again to rotate 180º

func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
        
        if type == .insert {
            blockOperations.append(BlockOperation(block: {
                self.msgsCollectionView.insertItems(at: [newIndexPath!])
            }))
        }
        
    }
    
    func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        
        if self.controller.fetchedObjects!.count > 0 {

            self.msgsCollectionView.reloadData()

        }
        
    }

Please check the output:

https://imgur.com/koYLhrM

How do I avoid cell layout effect??