Cannot add an Emoji on Pages 6.0.5

In Pages v6.0.5, you launch the Emoji & Symbols panel from the Edit menu. You locate the Emoji category, or if absent, you click on the gear icon in the upper-left corner, choose Customize List..., and select Emoji.

Click in the Pages document where you want to insert the specific emoji, and then double-click to to do the deed.

Works for me.

It works for me in either screen mode.

On my Mac, with Pages v6.0.5, I can change to fullscreen mode, bump my pointer against the top of the screen, and the Pages menu bar appears. Then it is the same instructions that I gave before.

On my Mac, it works fine with the expanded version of Character Viewer. But the smaller version of Character Viewer disappears after every input action and sometimes stops appearing altogether.

It works fine for me with either character palette form factor. Don't do much emoji insertions in Pages though. Like inserting an emoji within a poo emoji.