bug(CHECKBOX): `checked` status not properly reflected when updated through binding from within `change` event

[meblum]

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

When setting the checkbox checked state through data binding from within a change event handler , the component will not reflect the checked state. (Setting the state directly on the checkbox component, does work as expected)

Reproduction

StackBlitz link: bug demo
Steps to reproduce:

1. Create a checkbox
2. Bind checked to an isChecked property
3. Listen for change events
4. In event handler set isChecked to true

Expected Behavior

You should not be able to deselect the checkbox

Actual Behavior

The checkbox appears deselected

Environment

• Angular: 19.2.0
• CDK/Material: 19.2.0
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

[crisbeto]

It's because the checked binding isn't actually changing so the checkbox doesn't know to update.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}