Regarding Keyboard Arrow Navigation Not Working Properly with Custom Editor in DataGrid Cell Template

### Description

Regarding when the DataGrid loads a custom editor into the cell template, performing navigation using the keyboard (such as the left or right arrow keys) does not work properly.

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[Sample.zip](https://github.com/user-attachments/files/19069849/Sample.zip)

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Start the application with MainWindow2 in App.xaml.cs. Here, the editor is used without the DataGrid, and it works properly there.

For your reference attached the sample please review it.

### Reproduction Steps

**Run the sample.**
Try to enter content into the editor.


Try to navigate the cursor using the right/left arrow keys.
For your reference, the replication procedure video is attached.

### Expected behavior

The cursor should move based on keyboard navigation.

### Actual behavior

The cursor doesn't move based on navigation.

### Regression?

_No response_

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

_No response_

### Other information

_No response_