Toast: component loses its z-index when using "replace"

Describe the bug

Hello, we found an issue where the replace method make the toaster component loose its z-index value when there is a single message being show. When there are no messages or more than 1 it behaves correctly. We can see, inspecting the DOM, the z-index property disappearing from the toast component.

The onExited function is called by the CSS transition component and it clears the z-index:
https://github.com/primefaces/primereact/blob/f2294cc30eb2d13d36a4556159388ea9dde6ecb4/components/lib/toast/Toast.js#L95

Reproducer

https://stackblitz.com/edit/fx59uvcx?file=src%2FApp.jsx

System Information

Browser: Chrome, Firefox
primereact: 10.8.0, 10.9.7
react: 18.3.1

Steps to reproduce the behavior

1. Click "Show dialog"
2. Click "Show" once
3. Click "Replace": the message gets rendered behind the dialog

Note: we get the correct behavior if we click on "Show" multiple times, or clear all messages and use "Replace" once.

Expected behavior

The replacing message is rendered above the dialog.

Start with components/lib/toast/Toast.js, especially the onExited function identified in the report, then reproduce the single-message replace flow using the linked StackBlitz example. Confirm the toast's z-index remains present when replacing one message while a dialog is open, and run the relevant Toast tests if available.