Window decorations and panel input intermittently break after Cinnamon restart

Environment

• Linux Mint Cinnamon
• X11
• AMD GPU
• Cinnamon was restarted with cinnamon --replace

Problem

After some time, window interaction becomes inconsistent. Taskbar icons stop responding to mouse clicks, while the Cinnamon menu and file manager may still work.

The affected applications included:

• Visual Studio Code
• GNOME Terminal

The affected windows were unexpectedly restored with invalid or inconsistent states:

• _NET_WM_STATE_MAXIMIZED_HORZ
• _NET_WM_STATE_MAXIMIZED_VERT
• sometimes _NET_WM_STATE_FULLSCREEN

The title-bar buttons (minimize, maximize and close) were missing. Removing the window states with wmctrl restored normal behavior:

wmctrl -r "window title" -b remove,fullscreen
wmctrl -r "window title" -b remove,maximized_vert
wmctrl -r "window title" -b remove,maximized_horz

The issue appeared intermittently and was not caused by the Cinnamon button-layout setting, which was:

:minimize,maximize,close

Expected behavior

Cinnamon should preserve valid window decorations and panel input after restarting Cinnamon or restoring application windows. Maximized windows should not be restored as fullscreen or lose their title-bar controls.

Additional information

The issue was observed with both VS Code and GNOME Terminal, suggesting a possible Cinnamon/Muffin window-state or decoration restoration problem rather than an application-specific issue.

Please investigate whether Cinnamon/Muffin can incorrectly restore maximized/fullscreen window state or lose window decorations after cinnamon --replace.

Start with the reported Linux Mint Cinnamon/X11 setup, restart Cinnamon with cinnamon --replace, and observe VS Code or GNOME Terminal after panel or window interaction degrades. Use the listed wmctrl state-removal commands as a diagnostic comparison; done means maximized windows retain valid state, title-bar controls, and panel clicks after a restart.