Casting Queen Mab's Spell causes troop in position one to sometimes do the attack animation

What you were expecting to happen, and what actually happened?
When casting Queen Mab’s spell it should only show her attack animation. Sometimes it adds the first troop attack animation of jumping over the board. I don’t think it does any damage, it’s hard to tell as it’s a surprise when it happens.

What are the steps to make it happen again?
As far as I can tell it’s completely random. However, I’m using Soothsayer, Valkyrie, Justice, Queen Mab with Lion Banner and all fully traited except Justice only first trait. It happens maybe once out of 30 or 40 Mab casts?

Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!
I do not.

Just FYI: This type of bug has been around for more than a year, probably since launch. It doesn’t affect play, as far as I can tell, by anything more than an incorrect animation.