I can see that you did everything you could, @user61405. Ensuring you always have the latest transactions is a great help to make sure your books are updated. Since the same thing still occurs, I'm here to provide information about this. 

I appreciate you sharing details about the steps you've performed. 

Currently, there's an ongoing issue about Square transactions not updating in QuickBooks Online (QBO). Rest assured that we're doing all we can to fix this as soon as possible. To report this, I highly recommend reaching out to our Customer Care team. This way, you'll be added to the list of affected users to receive notifications about the investigation via email. To do so, please refer to the steps provided by my colleague above (for visual reference, check the snip below).

You'll also want to consider manually uploading transactions to QBO using a CSV file. For the detailed instructions, feel free to visit this link: Manually upload transactions into QuickBooks Online. Then, categorise and match them in the program. 

Additionally, it's recommended to reconcile your account regularly to ensure the balance matches your real-life bank account. Once done, QBO will create a report for that session which you can use as a guide to avoid mistakes in doing future ones.

Let me know how this goes. I'd appreciate any information you can add. If you have any other banking concerns, please don't hesitate to post again here. I'm always ready to lend a hand. Have a good one.