[Bug] Lines are vanishing

### Bug Description

I am writing a simple document within AppFlowy. Afterwards I switch the page, then come back, and some lines in between are just randomly missing. Its not like the latest changes, its something I changed somewhen, when the page was last opened.

### How to Reproduce

Rarely when editing a document.

### Expected Behavior

Dont lose the lines I wrote.

### Operating System

Windows 11

### AppFlowy Version(s)

0.11.9

### Screenshots

_No response_

### Additional Context

This is SO frustrating. I really think AppFlowy is a good application and I am using it for a long time and quite like it. But I did write things I really needed and now they are lost. With this unreliability it seems like this tool is not at all production ready. This hurts.