PanelMenu: expanded property doesn't work on the top list item

[mikejav]

Describe the bug

For the uncontrolled state, when PanelMenu's model.expanded property is set to true, the top list item is still collapsed.

For the nested list it works as expected (after opening the parent item)

Reproducer

https://stackblitz.com/edit/kp7quq?file=src%2FApp.jsx

System Information

System:
    OS: Windows 10 10.0.19045
    CPU: (12) x64 Intel(R) Core(TM) i5-10400F CPU @ 2.90GHz 
    Memory: 13.05 GB / 31.93 GB
  Binaries:
    Node: 20.10.0 - C:\Program Files\NodeJS 20.10.0\node.EXE
    npm: 10.2.3 - C:\Program Files\NodeJS 20.10.0\npm.CMD   
  Browsers:
    Edge: Chromium (130.0.2849.52)
    Internet Explorer: 11.0.19041.4355
  npmPackages:
    primereact: ^10.8.4 => 10.8.4 
    react: ^18.2.0 => 18.2.0

Steps to reproduce the behavior

1. Go to https://stackblitz.com/edit/kp7quq?file=src%2FApp.jsx
2. See the result. The highlighted expanded property is set to true while the component doesn't reflect it

Expected behavior

The PanelMenu component renders the expanded state for the items that has the expanded property set to true