Warning: -[NSWindow makeKeyWindow] called on <AppKit._NSGlassEffectWindow: 0x...> windowNumber=a221 which returned NO from -[NSWindow canBecomeKeyWindow]

This type of message (see title) is logged in the Xcode console each time a contextual menu (incuding a menu from an NSPopupButton) appears in my app, under macOS 27 (Xcode 27).

What does it mean?