Repro method:
1) Using Google Chrome version 88.0.4324.150 on desktop
2) Place mouse over follow/unfollow button
3) without clicking, remove curser from the button
Expected Behavior: The "Follow"/"Unfollow" speech bubble should appear when the mouse enters the button, and disappear when it leaves the button, as it does for the turn notifications on/off button.
Observed Behavior: The Speech bubble appears, but does not disappear until the mouse goes over another button.

Repro rate: 20/20 100% over multiple stream pages