Sidebar closes immediately after first click when returning from another application on KDE Wayland

Opera Version:
148.0.7778.180

Environment:

• Kubuntu (KDE Plasma)
• Wayland session
• AMD Radeon Graphics (Renoir)
• Mesa 26.0.3

Steps to Reproduce:

1. Open any Opera sidebar (Bookmarks, AI sidebar, ChatGPT sidebar, etc.)
2. Switch to another application
3. Return to Opera
4. Click inside the already-open sidebar

Expected:
Sidebar remains open and receives the click.

Actual:
The sidebar immediately closes as if Opera detected a click outside the sidebar.

Notes:

• Reproducible with all sidebars, not only ChatGPT.
• Happens consistently after focus is lost and regained.
• Tested with:
  • clean Opera profile
  • all extensions disabled
  • hardware acceleration disabled
  • --ozone-platform=x11
• Issue does not occur on Windows.