[Bug] Unexpected Data Loss - Dates in Grid have suddenly all automatically changed to a random date in 1970.

### Bug Description

I maintain a table in Grid format containing all the courses I have completed or am currently taking. In this table, I keep track of, among other things, the start date and the completion date. This always worked fine and reliably, until this week when I noticed that all dates had suddenly changed to August 22 or 23, 1970. It therefore seems that I have lost all my date data and will have to manually restore it record by record.

### How to Reproduce

I can not describe a reproduction approach since it happened automatically overnight completely unexpected.

### Expected Behavior

I expect reliable behavior in a grid with a lot of data. I expect that all data that I have added to the database per record remains unchanged and that no unexpected, automatic, and incorrect mutations are implemented without my intervention, resulting in data loss.

### Operating System

Zorin OS 18.1 Core; iPad OS; Android

### AppFlowy Version(s)

AppFlowy-0.12.5-linux-x86_64.AppImage

### Screenshots

### Additional Context

I always write positively about AppFlowy on my website reallinuxuser.com because I consider it a fantastic application that was reliable for me until recently and offers great features. I have now lost the dates for the courses I completed and will have to restore them manually. I hope this issue can be explained or resolved so that I can regain confidence in the application and continue writing positively to my readers.

Hopefully, you will find a solution.