bug(spinner): Spinner not rotating around the center when inside a mat-button

[UrzaUrza]

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 i put a mat-spinner inside a mat-icon-button, if the diameter of the spinner is not 24px then the spinner is not rotating around the center of the circle.

Reproduction

StackBlitz link: https://stackblitz.com/edit/wl81aqhc?file=src%2Fexample%2Fbutton-overview-example.html
Steps to reproduce:

1. Run
2. Watch

Expected Behavior

The spinner rotate around the center of the circle.

Actual Behavior

The spinner does not rotate around the center of the circle.

Environment

• Angular: 19.0.3
• CDK/Material: 19.0.2
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows