Hello there, nora rozin.
Let's recover your missing reconciled transaction by using the Auto Data Recovery feature in QuickBooks Desktop. This feature can help us recover any loss or corrupted data.
For your reference, kindly check this article on how to recover lost data with QuickBooks Auto Data Recovery.
If the same thing happens, I'd recommend contacting our Customer Care team. They can help you further with this. Also, they can create a report and send it to our engineers. This way, our engineers can investigate the issue that you've experienced.
Here's how to contact them:
Please let me know how it goes by leaving a comment below. I'd get back to you as quickly as I can.