The Avalonia main window restores its last size, position and maximized
state from the shared user settings and saves them when it closes, keeping
the normal bounds while maximized. On Windows it reads what the WinForms
app saved: WinForms stores the outer window and Avalonia sets the client
area, so the size differs by the frame between the two apps. --snapshot
skips it, so its image never depends on the user's settings.
