bug(Button & Table): Button inside table with sticky column overlaps

[XavierDupessey]

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

Hello,

When placing a mat-button inside a table cell, it appears above the sticky columns instead of being clipped or hidden like the rest:

20250513-1222-29.8035228.mp4

This issue is reproducible with:

• Angular Material 15: https://stackblitz.com/edit/3p4mdjwq?file=src%2Fapp%2Ftable-sticky-columns-example.html
• Angular Material 19: https://stackblitz.com/edit/dcghq85p?file=src%2Fexample%2Ftable-sticky-columns-example.html,src%2Fexample%2Ftable-sticky-columns-example.ts,package.json

I haven't tested with other versions.

Thanks!

Reproduction

StackBlitz link: https://stackblitz.com/edit/dcghq85p?file=src%2Fexample%2Ftable-sticky-columns-example.html,src%2Fexample%2Ftable-sticky-columns-example.ts,package.json
Steps to reproduce:

1. Scroll horizontally

Expected Behavior

The button should be hidden when scrolled out the visible area.

Actual Behavior

The button appears above the sticky columns.

Environment

• Angular: 19
• CDK/Material: 19
• Browser(s): Firefox
• Operating System (e.g. Windows, macOS, Ubuntu): Windows