Emoji reaction button becomes un-clickable when mouse stops moving

Summary

On an issue comment, when you mouseover the "emoji" button, it becomes un-clickable when you stop moving your mouse. You have to move the mouse again a tiny bit to make it clickable again.

Steps to reproduce

1. Go to an issue that has comments (example)
2. Scroll to any comment, hover over the emoji reaction button.
3. Notice that the button becomes non-clickable when you stop moving the mouse.

What is the current bug behavior?

The button is not clickable if you stop moving your mouse over it (until you start moving the mouse again, which makes it clickable again).

What is the expected correct behavior?

The button should always be clickable if the mouse is over it.

Relevant logs and/or screenshots

emoji-button-loses-focus-unexpectedly-720p

Output of checks

This bug happens on GitLab.com.

Possible fixes

It seems this coincides with the appearance of the tooltip. I suspect the tooltip JS is removing focus from the button.