Ajani Unyielding ability not working

The new Ajani's second ability, "Energize X, each of your creatures gets +X/+X," fails to work if a creature has already been buffed. It will energize gems, then you see the animation that he's buffing the creatures, but the creatures remain the same size.

It does work the first time, but any attempt to additionally buff the same creatures does not take hold.