bug(mat-chip-grid): when used with a matChipInput, element has children which are not allowed

[kainiedziela]

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

<mat-chip-grid> used with a matChipInput results in a critical accessibility error: "Element has children which are not allowed"

Reproduction

StackBlitz link: https://stackblitz.com/edit/yahkft?file=src%2Fexample%2Fchips-input-example.html
Steps to reproduce:

1. Install axe dev tools
2. Run axe through the example

Expected Behavior

Compliance with axe

Actual Behavior

Broken "aria-required-children" rule

Environment

• Angular: 16
• CDK/Material: 16
• Browser(s): any
• Operating System (e.g. Windows, macOS, Ubuntu): any

[wagnermaciel]

@zarend Could you take a look?