DataTable: headers are missing in responsive layout

[AniaKru95]

Describe the bug

DataTable headers do not display properly, using #header slot and stack responsiveLayout.

Reproducer

https://stackblitz.com/edit/2enqv4?file=src%2FApp.vue

PrimeVue version

3.32.0

Vue version

3.x

Language

TypeScript

Build / Runtime

Vite

Browser(s)

Firefox

Steps to reproduce the behavior

1. Create simple Datatable
2. Put responsiveLayout="stack"
3. Remove 'header' from datatable props
4. Add template 'header'
5. Place labels to template header
6. Check on mobile screen

Expected behavior

Display headers on mobile screens