bug(stepper): access to undefined

[it11ah1]

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

In steppers _updateSelectedItemIndex() this._keyManager is used without checking for undefined.
A problem occurs when calling reset(); after getting the stepper element from viewChild("stepper");

Reproduction

You can see the problem in the sources. No StackBlitz needed.

Expected Behavior

Calling reset() without TypeError

Actual Behavior

TypeError: Cannot read properties of undefined (reading 'updateActiveItem')

Environment

• Angular: 19.2.2
• CDK/Material: 19.2.3

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