P-InputGroup: Toggle button does not work as a child of inputgroup

[capkaempfer]

Describe the bug

When using an inputgroup to combine an inputfield and a togglebutton, the button is not recognized as such and has a border and rounded corners.

Environment

We are using Angular 17

Reproducer

https://stackblitz.com/edit/8tmow7

Angular version

17.3.1

PrimeNG version

17.12.0

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

20.11.1

Browser(s)

any

Steps to reproduce the behavior

1. create a p-inputgroup with a p-inputfield enclosed
2. put a p-togglebutton before and a p-button after the inputfield

Expected behavior

the p-togglebutton should work like any other button