PanelMenu: Separator: true does not showing inside submenu items

[luisotavio-dev]

Describe the bug

The PanelMenu with the attribute separator set to true is only working in a primary tree level (not working inside submenu). I can't seem to find a way to display a separator between submenu items.

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

Problem already reported in #15817, but it was not carried forward.

I tested it by adding other simple components (overwriting the separator with title tags, they are also not displayed). It's not something exclusive to dividers, apparently.

Reproducer

https://stackblitz.com/edit/github-bkyvdrm5

Environment

Stackblitz Demo or Local environment

Angular version

19.1.1

PrimeNG version

v19

Node version

22.13.0

Browser(s)

Edge 131.0.2903.146, Chrome 131.0.6778.265

Steps to reproduce the behavior

Stackblitz already configured

Expected behavior

The separator must also be usable in the internal levels of the panel menu (in the submenus).