bug(Autocomplete): Selected option is not deselected when first input is removed while panel is closed (without clicking on input field for focus)

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

Selected option does not get deselected when the input is cleared (without clicking on input field for focus) while the panel is closed.

https://github.com/user-attachments/assets/3930b00b-7131-4b98-b29b-597b8883eb94

### Reproduction

StackBlitz link:
Steps to reproduce:
1. Click on autocomplete input field.
2. Select an option from the list.
3. Hit backspace from keyboard. (NOTE - don't click on the input to focus the field so that the panel remains closed while hitting backspace)
4. On first backspace - the selection (checkmark) remains on the previously selected option and the panel gets opened.
5. On second backspace - the selection gets cleared because panel was already open.

### Expected Behavior

The selection should get cleared since the input value has changed.

### Actual Behavior

The selection does not get cleared.

### Environment

- Angular:
- CDK/Material:
- Browser(s):
- Operating System (e.g. Windows, macOS, Ubuntu):

Inizia riproducendo la sequenza di completamento automatico di Angular descritta: seleziona un’opzione, mantieni chiuso il pannello e premi Backspace senza riportare il focus sull’input. Traccia il modo in cui la prima modifica dell’input gestisce l’opzione selezionata e lo stato del pannello. È completato quando la selezione viene cancellata al primo Backspace mentre il pannello è chiuso; nell’issue non vengono indicati file o test.

Scritto dal modello di indicizzazione a partire dal testo della issue.