ComboBox resets selected item to the first one on Esc key press when the drop-down is closed

### Description

If you focus a ComboBox and press the Esc key, it resets the selected item to the first one. It happens when the ComboBox's drop-down is closed. In the .NET Framework 4.8, it didn't happen.

See the video:
https://github.com/user-attachments/assets/5db212dd-2d89-4fe1-b00d-07d23ace75f0

Here are the repro projects:
[ComboBoxTest.zip](https://github.com/user-attachments/files/19735871/ComboBoxTest.zip)

### Reproduction Steps

- Create a new WPF project in .NET6,8,9 (the bug is reproducible in all 3 versions)
- Add the following code into the MainWindow.xaml into the root Window tag:
```


1
2
3


```
- Run the project, click on the combo-box, click on the 3rd item in the drop-down, and then **press the Esc key** (when the drop-down is closed).

### Expected behavior

The selected item must not be changed on the Esc key press and must remain "3". That's how it worked in .NET Framework 4.8.

### Actual behavior

The selected item is reset to "1" after the Esc key press. That's very counterintuitive.

### Regression?

It's a regression to the .NET Framework 4.8 version.

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

_No response_

### Other information

_No response_