Yes.
Not just that but I’ve noticed that if I navigate away from the page after I click the heart, but before the green loading bar at the top stops, then the heart doesn’t stick even if it did turn green.
Honestly I might not have noticed that, had I not been an editor at a publication where I feel I should recommend every story I publish (if I can’t recommend it, I shouldn’t publish it) and I check if I didn’t miss any of the stories.