[Bug] Editing code blocks is very buggy

### Bug Description

When I try to edit a code block with a specific code, it behaves extremely strangely and I absolutely cannot do the changes I wish.

### Steps to Reproduce

1. Create a new page.
2. Create a code block.
3. Paste
```rs
for page_id in new_book.page_ids.iter() {
/*
a part of the key. */
```
into the block.
4. Try to insert a space after the dot in the comment.
5. Observe
- the cursor jumping to `new_book`,
- the removal of the `_` from `page_id`,
- the italics (should not appear in a code block).

### Expected Behavior

The editing should behave normally.

### Browser and Version

Firefox 151.0.4

### AppFlowy Version(s)

cloud 0.15.22, web 0.14.9

### Screenshots

(I'm pressing space when focused in the code block and the cursor is just after `.`.)

https://github.com/user-attachments/assets/6b205061-2229-4da4-8b71-234a751bf55b

### Logs and Console Output

On Ctrl+Z:
```
Invalid delete positions (start: 20, end: 20) for text length 20, skipping text deletion
```

### Additional Context

It seems it is related to the underscores and applying them as italics formatters.