p-buttonGroup throws console errors when styleClass is applied

[linkdotnet]

Describe the bug

Clicking buttons inside a button group leads to console errors. See either stackblitz example below or this simplified example:

<p-buttonGroup pStyleClass="flex">
  <p-button
    class="flex flex-grow"
    styleClass="flex-grow"
    [label]="primaryLabel"
    severity="primary"
    (onClick)="primaryClicked.emit()"
  ></p-button>
  <p-button
    class="flex-grow-0"
    severity="secondary"
    label="x"
    (onClick)="secondaryClicked.emit()"
  >
  </p-button>
</p-buttonGroup>

When clicking on one of the buttons, will lead to the following console error:

.localservice@runtime.134daa3c.js:26 ERROR TypeError: Cannot read properties of null (reading 'offsetParent')
    at _StyleClass.clickListener (primeng_styleclass.js?v=52dd93ed:123:23)
    at StyleClass_click_HostBindingHandler (primeng_styleclass.js?v=52dd93ed:281:22)
    at executeListenerWithErrorHandling (chunk-W5QGBK3I.js?v=52dd93ed:20172:12)
    at wrapListenerIn_markDirtyAndPreventDefault (chunk-W5QGBK3I.js?v=52dd93ed:20192:18)
    at HTMLElement.<anonymous> (chunk-HNFVE3SF.js?v=52dd93ed:2981:112)
    at _ZoneDelegate.invokeTask (zone.js:402:33)
    at chunk-W5QGBK3I.js?v=52dd93ed:8574:49
    at AsyncStackTaggingZoneSpec.onInvokeTask (chunk-W5QGBK3I.js?v=52dd93ed:8574:30)
    at _ZoneDelegate.invokeTask (zone.js:401:38)
    at Object.onInvokeTask (chunk-W5QGBK3I.js?v=52dd93ed:8764:25)

(Copy&Pasted from the stackblitz example).

This happens only when a button inside a buttonGroup is clicked.

Environment

Reproducer

https://stackblitz.com/edit/stackblitz-starters-1zfded

Angular version

18.1

PrimeNG version

18.0.0-beta.2

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

18.20.3

Browser(s)

Chrome

Steps to reproduce the behavior

Clicking a button inside a button-group where the p-buttonGroup has a styleClass.

Expected behavior

No response