bug(Expansion Panel): Expansion Panel is set to closed, but is open and then gets closed being inside the Stepper

[nilokadnedzar]

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 you have a closed Expansion Panel as part of the Stepper it is open and then gets closed. It should be closed right away.

This only happens when the default animation of the Stepper is enabled.

Reproduction

Steps to reproduce:

1. Put a closed Expansion Panel into the first step of the Stepper
2. Keep default animation enabled of Stepper
3. Reload app mutiple time

Expected Behavior

Expansion Panel should be closed right away.

Actual Behavior

Expansion Panel is open for some milliseconds and then gets closed.

Environment

• Angular: 13.2
• CDK/Material: 13.2.4
• Browser(s): Chrome 98.0.4758.109
• Operating System (e.g. Windows, macOS, Ubuntu): macOS Monterey 12.2.1

[zarend]

Hello, we took a look at this and couldn't reproduce. Could you please provide a stackblitz reproduction of the issue?

[crisbeto]

This should be the same root cause as #22785.

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