splitbutton: Accessibility does not appear to work as documented

[ppc-harmoney]

Describe the bug

Our application requires WCAG compliance. I am currently trying to add aria-labels to a splitButton component, for which I am following the documentation.

    <p-splitButton
        *ngIf="shouldShowSplit"
        [model]="menuItems"
        (onClick)="onAddClicked()"
        label="{{ 'BUTTON.add' | translate }}"
        buttonProps="{'aria-label': 'Add document'}"
        menuButtonProps="{'aria-label': 'More upload options'}"
        styleClass="split-button p-button-lg"
        menuStyleClass="split-button-menu"
        appendTo="body"
    />

However, I do not see these changes reflected in the DOM. Testing using a screenreader also indicates that these attributes were not set. Furthermore, when trying to bind with a template expression (i.e. square brackets) the compiler complains that these properties do not exist on the splitButton.

Environment

Angular 16.2.9

Cannot set up a test case because the issue template appears to be broken.

Reproducer

No response

Angular version

16.2.9

PrimeNG version

16.5.0

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

18.18.2

Browser(s)

No response

Steps to reproduce the behavior

Add buttonProps/menuButtonProps to p-splitButton

Expected behavior

I would expect to see the aria-label properties on the corresponding elements.