This is the same for me on discourse 3.4.1.
If I inspect the buttons in the browser console, I can see some of the popover, but it never becomes active when hovering the like button:
The whole thing does work - if I use the API to react to any of the reaction options, it is recorded correctly, and shows the count on the post with the emoji
Seems like an issue with the UI hover. I am new to discourse plugins, so haven’t looked into it beyond this. I also tried with a different theme, and didn’t work either.
No error in js console, so I have left it for now