External keyboard’s globe 🌐 (fn) key doesn't open emoji picker in clamshell mode

In the Keyboard settings of my MacBook, I have selected "Press 🌐 (globe) to Show Emoji & Symbols": While this works fine on the internal keyboard, pressing fn 🌐 on an external Magic Keyboard doesn't open the emoji picker when my MacBook is in the clamshell mode, that is when its lid is closed. Is there a way to make it work? *Update:* Actually, sometimes it doesn't work, and sometimes it does. It seems random so far.