On some platforms (at least on Ubuntu 24.04 with GNOME and Windows 11), windows can remain maximized even when they are iconified (minimized). When the window is de-iconified (restored), it retains its maximized state.

The documentation in Stage.java regarding window states seems to align with this behavior. However, the code currently treats the WindowEvent.RESTORE event as both an unminimize (de-iconify) and an unmaximize.