VirtualScroller: Unstyled mode is removing needed classes for core functionality

[afk-cob]

Describe the bug

Unstyled mode is removing needed classes for core functionality. Directly in component and in global config.

Reproducer

https://codesandbox.io/s/primevue-demo-forked-64ngdd?file=/src/main.js

PrimeVue version

3.32.2

Vue version

3.x

Language

ES6

Build / Runtime

Vite

Browser(s)

Chrome

Steps to reproduce the behavior

1. In main.js - app.use(PrimeVue, { unstyled: false, pt: Tailwind });
2. Copy/paste demo from VirtualScroller example on Primevue.org to some test component
3. On first lack of overflow-auto, component is breaking when scroll is at the bottom
4. Check console and inspect element - all classes needed for core functionality are removed
5. Need to add classses manually from example on Primevue, after that component works again

Expected behavior

Unstyled mode not removing core classes, only styled ones