[Error] 17.2 Mega Evolution (With EBS)

Hi there, I was hoping someone could help me. I'm experimenting with Mega Evolution on 17.2 and I'm using EBS, but for some reason, when I give an opponent trainer's pokemon a mega stone, the animation doesnt play and their pokemon's sprite doesnt change to the mega evolution. Everything works fine for the player's mega tho. Any help would be greatly appreciated. I recorded some footage real quick of whats happening so you can understand better. It wont let me post links, so DM me for the link if you want it

I'm not sure if its a problem with the code, but any help would be appreciated.

Did you give mega stone AND a Mega Ring to trainer?